Search for: [References = "10. Hillbricht\-Ilkowska A., Spodniewska I., Węgleńska T., Karabin A. 1970 – The seasonal variation of some ecological efficiencies and production rates in the plankton community of several Polish lakes of different trophy \(In\: Productivity problem of freshwaters, Eds. Z. Kajak, A. Hillbricht\-Ilkowska\) \- PWN, Warszawa\-Kraków, 111\-128."]

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