References
- Bišev, L., 1969: Anoxia may be foreseing. — Rybol'ovstvo i Rybovodstvo. 2: 11–12 (in Russian).
- Bròzda-Urbaniec, W., 1978: Phytoplankton in ponds with various level of intensification. — Acta Hydrobiol. in press, (in Polish, summary in English).
- Szumiec, J., 1976: Some experiments on intensive farming of common carp in Poland. — FAO Techn. Conf. on Aquaculture, Kyoto.
- Szumiec, M., 1975: The effect of controlled eutrophication on solar radiation penetring into the ponds. — Acta Hydrobiol. 17 (2): 149–182 (in Polish, summary in English).