For citations:

Abdurahmanov G.M., Ahmedova G.A., Rasulova M.M. About the influence of antropogenic factors of pollution on increase of trophic level of lake Ak-Gel. South of Russia: ecology, development. 2009;4(2):155-157. (In Russ.) https://doi.org/10.18470/1992-1098-2009-2-155-157