References
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- Huttunen, P. & Meriläinen, J., 1983: Interpretation of lake quality from contemporary diatom assemblages. — Hydrobiologia 103: 91–97.
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- Ilmavirta, K. & Kotimaa, A.-L., 1974: Spatial and seasonal variations in phytoplanktonic primary production and biomass in the oligotrophic Lake Pääjärvi, southern Finland. — Ann. Bot Fennici 11: 112–120.
- Ilmavirta, V., 1980: Phytoplankton in 35 Finnish brown-water lakes of different trophic status. — Devel. Hydrobiol. 3: 121–130.
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