Academic article

• Archontikis, Odysseas A.; Millán, Josué G.; Andruleit, Harald et al. (2023). Taxonomy and morphology of Calciopappus curvus sp. nov. (Syracosphaeraceae, Prymnesiophyceae), a novel appendage-bearing coccolithophore. (external link)
• Erga, Svein Rune; Heldal, Mikal; Prestegard, Siv Kristin et al. (2022). The importance of microbiota and terrestrial inflows in controlling seston C:N:P:O:Si:Ca:Mn:Mg:Fe:K:Na:Cl:S:Cu:Zn stoichiometry of a deep coastal fjord. (external link)
• Erga, Svein Rune; Haugen, Stig Bjarte; Bratbak, Gunnar et al. (2017). Seasonal variations in C:N:Si:Ca:P:Mg:S:K:Fe relationships of seston from Norwegian coastal water: Impact of extreme offshore forcing during winter-spring 2010. (external link)
• Thomsen, Helge Abildhauge; Egge, Jorun Karin; Heldal, Mikal (2016). Papposphaera obpyramidalis (Haptophyta, Papposphaeraceae):New findings from both Polar Regions.. (external link)
• Thomsen, Helge A.; Østergaard, Jette B.; Heldal, Mikal (2016). Coccolithophores in polar waters: Papposphaera sagittifera HET and HOL revisited. (external link)
• Romann, Julien Clement; Chauton, Mathilde Skogen; Hanetho, Sidsel Meli et al. (2016). Diatom frustules as a biomaterial: effects of chemical treatment on organic material removal and mechanical properties in cleaned frustules from two Coscinodiscus species. (external link)
• Paulino, Ana Isabel; Heldal, Mikal; Norland, Svein et al. (2013). Elemental stoichiometry of marine particulate matter measured by wavelength dispersive X-ray fluorescence (WDXRF) spectroscopy. (external link)
• Grob, Carolina; Ostrowski, Martin; Holland, Ross J. et al. (2013). Elemental composition of natural populations of key microbial groups in Atlantic waters. (external link)
• Carreira, Cátia; Heldal, Mikal; Bratbak, Gunnar (2013). Effect of increased pCO(2) on phytoplankton-virus interactions. (external link)
• Steenbergh, A.K.; Bodelier, P.L.E.; Heldal, Mikal et al. (2013). Does microbial stoichiometry modulate eutrophication of aquatic ecosystems?. (external link)
• Heldal, Mikal; Norland, Svein; Erichsen, Egil Severin et al. (2012). Mg2+ as an indicator of nutritional status in marine bacteria. (external link)
• Heldal, Mikal; Norland, Svein; Erichsen, Egil Severin et al. (2012). An unaccounted fraction of marine biogenic CaCO3 particles. (external link)
• Thingstad, T. Frede; Bellerby, Richard; Bratbak, Gunnar et al. (2008). Counterintuitive carbon-to-nutrient coupling in an Arctic pelagic ecosystem. (external link)
• Løvdal, Trond Karsten; Skjoldal, Evy Foss; Heldal, Mikal et al. (2008). Changes in morphology and elemental composition of Vibrio splendidus along a gradient from carbon-limited to phosphate-limited growth. (external link)
• Jacquet, Stephan; Domaizon, Isabelle; Personnic, Sébastien et al. (2005). Estimates of protozoan- and viral-mediated mortality of bacterioplankton in Lake Bourget (France). (external link)
• Thingstad, Tron Frede; Øvreås, Lise; Egge, Jorun Karin et al. (2005). Use of non-limiting substrates to increase size; a generic strategy to simultaneously optimize uptake and minimize predation in pelagic osmotrophs?. (external link)
• Brussaard, Corina P.D.; Noordeloos, A.A.M.; Sandaa, Ruth-Anne et al. (2004). Discovery of a dsRNA virus infecting the marine photosynthetic protist Micromonas pusilla. (external link)
• Landa, Harald; Bratbak, Gunnar; Heldal, Mikal (2004). Abundance and dynamics of free flagellate scales in marine costal ecosystems. (external link)
• Øvreås, Lise; Bourne, David; Sandaa, Ruth-Anne et al. (2003). Response of bacterial and viral communities to nutrient manipulations in seawater mesocosms. (external link)
• Heldal, Mikal; Scanlan, Dave J.; Norland, Svein et al. (2003). Elemental composition of single cells of various strains of marine Prochlorococcus and Synechococcus using X-ray microanalysis. (external link)
• Oren, A.; Heldal, Mikal; Norland, Svein et al. (2002). Intracellular ion and organic solute concentrations of the extremely halophilic bacterium Salinibacter ruber. (external link)
• Castberg, Tonje; Thyrhaug, Runar; Larsen, Aud et al. (2002). Isolation and characterization of a virus that infects Emiliania huxleyi (Haptophyceae). (external link)
• Vrede, Katarina; Heldal, Mikal; Norland, Svein et al. (2002). Elemental composition (C,N,P)and cell volume of exponentially growing and nutrient limited bacterioplankton. (external link)
• Jacquet, Stephan; Heldal, Mikal; Iglesias-Rodriguez, Debora et al. (2002). Flow cytometric Analysis of an E. Huxleyi bloom terminated by viral infection. (external link)
• Gundersen, Kjell; Heldal, Mikal; Norland, Svein et al. (2002). Elemental C, N, and P cell content of individual bacteria collected at the Bermuda Atlantic Time-series Study (BATS) site. (external link)
• Sandaa, Ruth-Anne; Heldal, Mikal; Castberg, Tonje et al. (2001). Isolation and characterization of two viruses with large genome size infecting Chrysochromulina ericina (Prymneriophyceae) and Pyramimonas orientalis (Prasinophyceae). (external link)
• Castberg, Tonje; Larsen, Aud; Sandaa, Ruth-Anne et al. (2001). Microbial population dynamics and diversity during a bloom of the marine coccolithophorid Emiliania huxleyi (Haptophyta). (external link)
• Larsen, Aud; Castberg, Tonje; Sandaa, Ruth-Anne et al. (2001). Population dynamics and diversity of phytoplankton, bacteria and viruses in a seawater enclosure. (external link)
• Rodriguez, F.; Fernandez, E.; Head, R.N. et al. (2000). Temporal variability of viruses, bacteria, phytoplankton and zooplankton in the western English Channel off Plymouth. (external link)
• Bratbak, Gunnar; Heldal, Mikal (2000). Virus rule the waves - the smallest and most abundant members of marine ecosystems. (external link)
• Fagerbakke, Kjell Magne; Norland, Svein; Heldal, Mikal (1999). The inorganic ion content of native aquatic bacteria. (external link)
• Mostajir, Behzad; Fagerbakke, Kjell Magne; Heldal, Mikal et al. (1998). Elemental composition of individual pico- and nano- sized marine detrital particles in the northwestern Medeteranian Sea. (external link)
• Bratbak, Gunnar; Jacobsen, Anita; Heldal, Mikal et al. (1998). Virus production in Phaeocystis pouchetii and its relation to host cell growth and nutrition. (external link)
• Bratbak, Gunnar; Jacobsen, Anita; Heldal, Mikal (1998). Viral lysis of Phaeocystis pouchetii and bacterial secondary production. (external link)
• Bratbak, Gunnar; Jacobsen, Anita; Heldal, Mikal (1998). Viral lysis of Phaeocystis pouchetii and bacterial secondary production. (external link)
• Bratbak, Gunnar; Jacobsen, Anita; Heldal, Mikal et al. (1998). Virus production in Phaeocystis pouchetii and its relation to host cell growth and nutrition. (external link)
• Mostajir, B.; Fagerbakke, Kjell Magne; Heldal, Mikal et al. (1998). Elemental composition of individual pico- and nano-sized marine detrital particles in the northwestern Mediterranean Sea. (external link)
• Oren, Aharon; Bratbak, Gunnar; Heldal, Mikal (1997). Occurrence of virus-like particles in the Dead Sea. (external link)
• Tuomi, P.; Torsvik, Terje; Heldal, Mikal et al. (1997). Bacterial population dynamics in a meromictic lake. (external link)
• Oren, Aharon; Heldal, Mikal; Norland, Svein (1997). X-ray microanalysis of intracellular ions in the anaerobic halophilic eubacterium <i>Haloanaerobium praevalens</i>. (external link)
• Heldal, Mikal; Norland, Svein; Fagerbakke, Kjell Magne et al. (1996). The elemental composition of bacteria: a signature of growth conditions?. (external link)
• Bratbak, Gunnar; Heldal, Mikal; Thingstad, Tron Frede et al. (1996). Dynamics of virus abundance in coastal seawater. (external link)
• Fagerbakke, Kjell Magne; Heldal, Mikal; Norland, Svein (1996). Content of carbon, nitrogen, oxygen, sulfur and phosphorus in native aquatic and cultured bacteria. (external link)
• Heldal, Mikal (1996). Poluphosphate bodies aligned along the anterior axoneme of the cryptomonad Rhodomonas lacustris: Possible relevance to symbiotic origin of Undulipodia. (external link)
• Brussard, Corina P. D.; Kempers, Rob S.; Kop, Arjen J. et al. (1996). Virus-like particles in a summer bloom of Emiliania huxleyi in the North Sea. (external link)
• Gundersen, Kjell; Bratbak, Gunnar; Heldal, Mikal (1996). Factors influencing the loss of bacteria in preserved seawater samples. (external link)
• Bratbak, Gunnar; Willson, William; Heldal, Mikal (1996). Viral control of Emiliania huxleyi blooms?. (external link)
• Jacobsen, Anita; Bratbak, Gunnar; Heldal, Mikal (1996). Isolation and characterisation of a virus infecting Phaeocystis pouchetii (Haptophyceae). (external link)
• Jacobsen, Anita; Bratbak, Gunnar; Heldal, Mikal (1996). Isolation and characterization of a virus infecting Phaeocystis pouchetii (Prymnesiophyceae). (external link)
• Tuomi, Pirjo; Fagerbakke, Kjell Magne; Bratbak, Gunnar et al. (1995). Nutritional enrichment of a microbial community: The effects on activity, elemental composition, community structure and virus production. (external link)
• Bratbak, Gunnar; Levasseur, M.; Michaud, M. et al. (1995). Viral activity in relation to Emiliania huxleyi blooms: a possible mechanism of DMSP release?. (external link)
• Bratbak, Gunnar; Levasseur, M.; Michaud, M. et al. (1995). Viral activity in relation to Emiliania huxleyi blooms: a possible mechanism of DMSP release?. (external link)
• Norland, Svein; Fagerbakke, Kjell Magne; Heldal, Mikal (1995). Light element analysis of individual bacteria by X-ray microanalysis. (external link)
• Fagerbakke, K. M.; Heldal, Mikal; Norland, Svein et al. (1994). Emiliania huxleyi. Chemical compositiln and size of coccoliths from enclosure experiments and a Norwegian fjord. (external link)
• Heldal, Mikal; Norland, Svein; Bratbak, Gunnar et al. (1994). Determination of bacterial cell number and cell volume by means of flow cytometer, transmission electron microscopy, and epifluorescene microscopy. (external link)
• Fagerbakke, K. M.; Heldal, Mikal; Norland, Svein et al. (1994). Emiliania huxleyi: Chemical composition and size of coccoliths from enclosure experiments and a Norwegian fjord. (external link)
• Bratbak, Gunnar; Egge, Jorun Karin; Heldal, Mikal (1993). Viral mortality of the marine alga Emiliania huxleyi (Haptophyceae) and termination of algal blooms. (external link)
• Bratbak, Gunnar; Egge, Jorun Karin; Heldal, Mikal (1993). Viral mortality of the marine algae Emiliania huxleyi (Haptophyceae) and termination of algal blooms. (external link)
• Thorseth, Ingunn Hindenes; Furnes, Harald; Heldal, Mikal (1992). The importance of microbiological activity in the alteration of natura l basaltic glass. (external link)
• Bratbak, Gunnar; Heldal, Mikal; Thingstad, T.F et al. (1992). Incorporation of viruses into the budget of microbial C-transfer. A first approach. (external link)
• Thorseth, Ingunn Hindenes; Furnes, Harald; Heldal, Mikal (1992). The importance of microbiological activity in the alteration of natural basaltic glass. (external link)
• Fagerbakke, K. M.; Heldal, Mikal; Norland, Svein (1991). Variation in elemental content among and within trichomes in Nostoc calcicola 79WA01 measured by x-ray micro-analysis. (external link)
• Kjeldstad, B.; Heldal, Mikal; Nissen, H. et al. (1991). Changes in polyphosphate composition and localization in Propionebacterium acnes after near-ultraviolet irradiation. (external link)
• Heldal, Mikal; Bratbak, Gunnar (1991). Production and decay of viruses in aquatic environments. (external link)
• Børsheim, K. Y.; Bratbak, Gunnar; Heldal, Mikal (1990). Enumeration and biomass estimation on planktonic bacteria and viruses by transmission electron microscopy. (external link)
• Bratbak, Gunnar; Heldal, Mikal; Norland, Svein et al. (1990). Viruses as Partners in Spring Bloom Microbial Trophodynamics. (external link)
• Bergh, Ø; Børsheim, K. Y.; Bratbak, Gunnar et al. (1989). High abundance of viruses found in aquatic environments. (external link)
• Bergh, Øivind; Børsheim, Knut Yngve; Bratbak, Gunnar et al. (1989). High abundance of viruses found in aquatic environments. (external link)

Academic literature review

• Våge, Selina; Bratbak, Gunnar; Egge, Jorun Karin et al. (2018). Simple models combining competition, defence and resource availability have broad implications in pelagic microbial food webs. (external link)

Academic lecture

• Tsagaraki, Tatiana; Egge, Jorun Karin; Bratbak, Gunnar et al. (2017). Microbial Food web structure in a changing Arctic.. (external link)
• Thingstad, T.F.; Bellerby, Richard; Bratbak, Gunnar et al. (2008). Increased level of CO2 in the ecosphere may modify the structure of marine plankton. (external link)
• Thyrhaug, Runar; Einen, Jørn; Sandaa, Ruth-Anne et al. (2007). Total numbers and activity of environmental airborne bacteria. (external link)
• Heldal, Mikal; Norland, Svein; Thingstad, Tron Frede et al. (2005). Single cell analysis: X-ray microanalysis in TEM. (external link)
• Heldal, Mikal; Bratbak, Gunnar; Thingstad, Tron Frede et al. (2005). Single cell analysis: X-ray microanalysis in TEM. (external link)
• Heldal, Mikal; Norland, Svein; Bratbak, Gunnar et al. (2005). X-ray microanalyses of bacteria at the single cell level: Does elemental composition of cells relate to activity and nutritional status of cells?. (external link)
• Larsen, Aud; Thyrhaug, Runar; Sandaa, Ruth-Anne et al. (2002). Marine phytoplankton viruses - ecology, physiology and host virus interactions. (external link)
• Larsen, Aud; Castberg, Tonje; Sandaa, Ruth-Anne et al. (2002). Marine Phytoplankton Viruses-Ecology, Physiology and Host Virus Interactions. (external link)
• Brussaard, Corina; Sandaa, Ruth-Anne; Heldal, Mikal (2001). The discovery of a novel algal virus type infecxtion of the phytoplankter Micromonas pusilla by a double stranded RNA reovirus. (external link)
• Norland, Svein; Heldal, Mikal; Erichsen, Egil S. (2001). Analytisk elektronmikroskopi: måling av elementsammensetning i enkeltceller. (external link)
• Heldal, Mikal (2001). Ny metode for kontroll av toksinproduserende cyanobakterier. (external link)
• Oren, A.; Rodriguez-Valera, F.; Heldal, Mikal et al. (2001). Osmotic adaptation of the extremely halophilic Bacterium Salinibacter ruber, an inhabitant of NaCl-saturated environments. (external link)
• Bratbak, Gunnar; Brussaard, Corina P. D.; Castberg, Tonje et al. (2000). Diversity and succession of algae, virus and bacteria in nutrient enriched seawater enclosures. (external link)
• Sandaa, Ruth-Anne; Heldal, Mikal; Castberg, Tonje et al. (2000). Isolation and characterization of two marine viruses infecting Chrysochromulina ericina and Pyramimonas orientalis. (external link)
• Heldal, Mikal (2000). Aquatic viruses. (external link)
• Heldal, Mikal; Norland, Svein; Erichsen, E.S. (2000). TEM -X-ray microanalysis of single cells from aquatic Environments. (external link)
• Sandaa, Ruth-Anne; Larsen, Aud; Castberg, Tonje et al. (2000). Population dynamics in the virioplankton community during marine algal blooms. (external link)
• Flaten, Gro Anita Fonnes; Fagerbakke, Kjell Magne; Heldal, Mikal (1999). Magnesium content of marine bacteria at various growth conditions, measured by X-ray microanalysis. (external link)
• Norland, Svein; Heldal, Mikal (1999). Elemental content of individual bacteria. (external link)
• Fagerbakke, Kjell Magne; Norland, Svein; Heldal, Mikal (1998). Inorganic ions in marine bacterioplanktona. (external link)
• Heldal, Mikal; Tuomi, P.; Norland, Svein et al. (1998). Isolates of marine bacteria: elemental content relates to growth conditions [poster]. (external link)
• Bratbak, Gunnar; Heldal, Mikal (1998). Ecology of <EM>Phaeocystis</EM> host-virus interactions. (external link)
• Fagerbakke, Kjell Magne; Norland, Svein; Heldal, Mikal (1998). Inorganic ions in marine bacteria. (external link)
• Bratbak, Gunnar; Heldal, Mikal (1998). Ecology of Phaeocystis host-virus interactions. (external link)
• Thingstad, Tron Frede; Bratbak, Gunnar; Heldal, Mikal et al. (1997). Trophic interactions controlling the diversity in pelagic microbial food webs. (external link)
• Bratbak, Gunnar; Heldal, Mikal; Utkilen, H. et al. (1997). Viral impact on algal blooms. (external link)
• Bratbak, Gunnar; Heldal, Mikal; Thingstad, Tron Frede (1997). The marine microbial ecology revised. (external link)
• Nagasaki, Keizo; Wilson, William; Heldal, Mikal et al. (1996). Preliminary analysis of structural proteins and DNA of PpV-1, a large dsDNA virus which is infectious to Phaeocystis pouchetii. (external link)
• Guixa-Boixareu, Núria; Calderón-Paz, Juan; Heldal, Mikal et al. (1996). Viral lysis and bacterivory as prokaryotic loss factors along a salinity gradient. (external link)
• Tuomi, Pirjo; Torsvik, Terje; Heldal, Mikal et al. (1996). Bacterial population dynamics in a meromictic lake Sælenvatnet. (external link)
• Jacobsen, Anita; Bratbak, Gunnar; Heldal, Mikal (1996). Isolation of a virus infecting Phaeocystis pouchetii (Haptophyceae). (external link)
• Norland, Svein; Bratbak, Gunnar; Fagerbakke, Kjell Magne et al. (1995). Quantitative analysis of carbon, nitrogen, oxygen and phosphorous in single bacteria by use of X-ray - TEM. (external link)
• Heldal, Mikal; Bratbak, Gunnar (1995). Algevirus - kontrollerer de oppblomstringer?. (external link)
• Fagerbakke, K. M.; Heldal, Mikal (1994). Marine iron-maganese sequestering cyanobacteria. (external link)
• Bratbak, Gunnar; Thingstad, Tron Frede; Heldal, Mikal (1993). Virus and the Microbial Loop, Paradigms and Paradoxes in the microbial loop. (external link)
• Heldal, Mikal; Bratbak, Gunnar (1993). Decay and fate of aquatic viruses. (external link)
• Thorseth, Ingunn Hindenes; Furnes, Harald; Tumyr, Ole et al. (1992). Microbiological activity in the alteration of some Icelandic hyaloclastites. Abstracts. (external link)
• Thorseth, Ingunn Hindenes; Furnes, Harald; Heldal, Mikal et al. (1992). Microbiological activity in the alteration of volcanic glass from Surtsey, Iceland. (external link)
• Heldal, Mikal (1992). Nordisk Linkonferanse. (external link)
• Heldal, Mikal (1992). International symposium in microbial ecology. 6. (external link)

Editorial

• Brussaard, Corina P.D.; Wilhelm, Steven W.; Thingstad, T. Frede et al. (2008). Global-scale processes with a nanoscale drive: the role of marine viruses. (external link)

Academic chapter/article/Conference paper

• Thingstad, T. Frede; Bratbak, Gunnar; Heldal, Mikal (2008). Aquatic phage ecology. (external link)
• Heldal, Mikal; Bratbak, Gunnar; Erichsen, Egil S. et al. (2003). X-ray microanalysis of native aquatic bacteria. (external link)
• Heldal, Mikal (2001). Mirakelbakterien. (external link)
• Heldal, Mikal (2000). Morphology as a parameter for diversity in bacterial populations. (external link)
• Heldal, Mikal (1997). Klubba-Adno og fola hennar. (external link)
• Heldal, Mikal (1997). Kalkbrenning. (external link)
• Heldal, Mikal (1996). "Med den slemme spedalched... angreben". (external link)
• Heldal, Mikal (1993). Measurements of elemental content and dry weight of single cells: X-ray microanalysis. (external link)
• Bratbak, Gunnar; Heldal, Mikal (1993). Total Counts of Viruses in Aquatic Environments. (external link)

Poster

• Norland, Svein; Bratbak, Gunnar; Thingstad, Tron Frede et al. (2005). Bacterial physiology at the single cell level: do elemental composition reveals any signatures related to growth, dormancy or death?. (external link)
• Heldal, Mikal; Norland, Svein; Erichsen, Egil Severin et al. (2005). Mg2+ plays an important role in marine bacteria. (external link)
• Løvdal, Trond; Heldal, Mikal; Bratbak, Gunnar (2002). Can UV C-radiation restrict toxic algal blooms? Experimental studies for the determination of suitable radiation dose and fractions of water treated. (external link)
• Øvreås, Lise; Bourne, David; Heldal, Mikal et al. (2001). Microbial diversity in nutrient manipulated mesocosms. (external link)
• Øvreås, Lise; Bourne, David; Heldal, Mikal et al. (2001). Microbial diversity in nutrient manipulated mesocosms. (external link)
• Øvreås, Lise; Daae, Frida L.; Heldal, Mikal et al. (2001). Procaryotic diversity in hypersaline environments. (external link)
• Bratbak, Gunnar; Brussaard, Corina; Castberg, Tonje et al. (1999). Virus i Havet. (external link)
• Heldal, Mikal; Tuomi, P; Norland, Svein et al. (1996). Elemental content in isolates of natural bacteria at different stages of growth. (external link)
• Bratbak, Gunnar; Egge, Jorun Karin; Heldal, Mikal (1995). Viral control of algal blooms?. (external link)
• Heldal, Mikal; Tuomi, Pirjo; Fagerbakke, Kjell Magne et al. (1995). Detection of polyphosphate bodies in bacteria: fluorescens microscopy and X-ray microanalysis. (external link)
• Fagerbakke, K. M.; Heldal, Mikal (1994). A new abundent group of Iron/Maganese sequestering cyanobacteria. (external link)
• Fagerbakke, K. M.; Heldal, Mikal; Norland, Svein et al. (1993). Emiliania huxleyi: Elemental composition in coccoliths. (external link)
• Fagerbakke, K. M.; Heldal, Mikal; Norland, Svein (1993). Chemical composition related to activity of marine bacteria. (external link)
• Fagerbakke, K. M.; Heldal, Mikal; Norland, Svein (1993). Emiliania huxleyi: Elemental composition in coccoliths. (external link)

Popular scientific article

• Heldal, Mikal (2001). Mot vest med flatpakka båt. (external link)
• Heldal, Mikal (2001). Nokre hendingar frå krigsåra i Flakkavågen. (external link)
• Nesje, Ann Marie; Heldal, Mikal (1999). Ei utvandrar-soge frå Tysnes. (external link)
• Heldal, Mikal (1999). Minderne og Sangerhuen. (external link)
• Nesje, Anne Marie Skriveseth; Heldal, Mikal (1998). Ei utvandrar-soge frå Tysnes. (external link)
• Heldal, Mikal (1994). Blodiglar brukte i folkemedisin. (external link)

Popular scientific lecture

• Fagerbakke, Kjell Magne; Norland, Svein; Heldal, Mikal (1998). X-ray microanalysis (XRMA): single cell analysis of biological significant elements. CNP(OS) ratios and diffusible ions in micro-organisms. (external link)
• Fagerbakke, Kjell Magne; Norland, Svein; Heldal, Mikal (1998). Elemental composition in single native marine bacteria. (external link)
• Heldal, Mikal; Bratbak, Gunnar; Thingstad, Tron Frede (1994). The possible impact of viruses on marine food webs. (external link)
• Heldal, Mikal (1994). Osmotic and nutritional status of bacteria in aquatic communities. (external link)
• Bratbak, Gunnar; Heldal, Mikal (1994). Viruses - the new players in the game.... (external link)
• Bratbak, Gunnar; Heldal, Mikal (1994). Virus og bakterier sin økologiske rolle i akvatiske miljøer. (external link)
• Heldal, Mikal (1993). The viral loop: The impact of viruses on microbial communities. (external link)
• Bratbak, Gunnar; Heldal, Mikal (1993). Carbon budget in the microbial/viral loop. (external link)
• Heldal, Mikal (1993). Virus i mikrobielle samfunn. (external link)
• Heldal, Mikal (1993). Det norske bioenergi-forskningsprogrammet. (external link)
• Heldal, Mikal (1993). Decay of viral particles: Methodological considerations. (external link)
• Norland, Svein; Fagerbakke, Kjell Magne; Heldal, Mikal (1993). C, N and P analysis of single cells. (external link)

Compendium

• Bratbak, Gunnar; Heldal, Mikal (1997). Program and group reports from course in Microbial activity and diversity in aquatic interphases. (external link)

Non-fiction book

• Bratbak, Gunnar; Heldal, Mikal; Joint, Ian (1995). Viruses - the new players in the game; their ecologial role and could they mediate genetic exchange by transduction?. (external link)

Report

• Vadstein, O; Heldal, Mikal (1992). Occurence of dissolved and particulate nutrients. (external link)
• Heldal, Mikal; Knutsen, G (1989). Sluttrapport til Direktoratet for naturforvaltning for prosjektet "Chr ysochromulina. Algenes fyiologiske egenskaper". (external link)

See a complete overview of publications in Cristin.