References
- Hakkari, L., 1972: Zooplankton species as indicators of environment. — Aqua Fenn. 1972: 46–54
- Kowalik W., 1978: Occurrence of Hydracarina in the lakes of various trophy in the Łęczna-Włodawa Lake District. — Ann. Univ. Mariae Curie-Skłodowska C 33: 443–468 (in Polish, English summary).
- Odum, E. P., 1969: Ecology. — Warsaw, 217 pp. (in Polish).
- Pejler, B., 1965: Regional-ecological studies of swedish freshwater zooplankton. — Zool. Bidr. Uppsala 36: 407–515.
- Kajak, Z. 1981: On the use of zooplankters as environmental indicators: Some Approaches to Saprohiol. Problems 1981: 9–12.
- Radwan, S., 1976: Planktonic rotifers as indicators of lake trophy. — Ann. Univ. Mariae Curie-Skłdowska C31: 227–235.