1. Alm, G., Limnologisch-Fischereiliche Untersuchungen in den Kälarne-Seen, Inst. Freshwater Res. Drottingholm, Rep. no. 41, pp. 5–148.
2. Carlson, R.E., A Trophic State Index for Lakes, Limnol. Oceanogr., 1977, vol. 22, issue 2, pp. 361–369.
3. Harrison, J.W. and Smith, R.E.H., The Spectral Sensitivity of Phytoplankton Communities to Ultraviolet Radiation-Induced Photoinhibition Differs Among Clear and Humic Temperate Lakes, Limnol. Oceanogr., 2011, vol. 56, issue 6, pp. 2115–2126.
4. (Phys. & Math.) Dissertation;AD Aponasenko,2002
5. Bul’on, V.V., The Relationship Between Plankton Concentration and Water Transparency in Lakes and Reservoirs, in Morphology, Systematics and Evolution of Animals: Coll. Sci. Papers, Leningrad: Izd. Zool. Inst., 1968, pp. 49–50 [in Russian].