References
- Arnold, D. E., 1971: Ingestion, assimilation, survival, and reproduction by Daphnia pulex fed seven species of blue-green algae. — Limnol. Oceanogr. 16: 906–920.
- Edmondson, W. T., 1970: Phosphorus, nitrogen, and algae in Lake Washington after diversion of sewage. — Science 164: 690–691.
- Edmondson, W. T., Anderson, G. C. & Peterson, D. R., 1956: Artificial eutrophication of Lake Washington. — Limnol. Oceanogr. 1: 47–53.
- Freshwater Fisheries Experimental Station Ibaraki Prefecture, 1956, 1957, 1958, 1960, 1961, 1966, 1969, 1973, 1975, 1976, 1977, 1978, 1979: Report of Freshwater Fisheries Experimental Station Ibaraki Prefecture (in Japanese).
- Hasler, A. D., 1947: Eutrophication of lakes by domestic drainage. — Ecology 28: 383– 395.
- Ibaraki Prefecture, 1972, 1973, 1975, 1979: Environmental White Paper of Ibaraki Prefecture (in Japanese).
- Ibaraki University, 1977: Kasumigaura. — Sankyo Shuppan, Tokyo, 203 pp. (in Japanese).
- Iwaki, H., 1978: Changes of agricultural activity and flow of nitrogen in the drainage area of Lake Kasumigaura. — In: Lake Kasumigaura, and environment and human activities of its drainage area: 45–54 (in Japanese).
- Kanto Agricultural Administration Bureau, 1954–1976: Annual census of agriculture, forestry, and fishery of Ibaraki Prefecture (in Japanese).
- Sakamoto, M., 1962: Primary production and trophic degree of lakes. — Jap. J. Limnol. 23: 73–85 (in Japanese).