1. 1) W.T.Edmondson : Eutrophication : Causes, Consequences and Correctives, National Academy of Sciences Pub,, Washington DC, (1969). 249.
2. 2) H.Sas : Lake Restoration by Reduction of Nutrient Loading, Academia Verlag Richarz GmbH, St. Augustin, (1989), 497.
3. 3) J.G. Stockner, E. Rydin and P. Hyenstrand : Fisheries, 25 (2000), 7.
4. 5) T.Yamamoto, M.Ishida and T.Seiki : Bull. Jpn. Soc. Fish. Oceanogr., 66 (2002), 102.
5. 6) T.Yamamoto, O.Matsuda and T.Hashimoto : Red Tides, ed. by T. Okaichi, Terra Sci. Publ., Tokyo, (2002), 272.