1. Abrosov, V. N., 1973. Ozero Balkhash. (Lake Balkhash). – L.: Nauka, Leningrad Division, (in Russian) 142 pp.
2. Andreev, N. I. & S. I. Andreeva, 1998. Classification of the water in Aral Sea on hydrobiological basis. Manuscript in VINITI RAS 24.04.98, N 1318-B 98, Omsk, (in Russian) 35 pp.
3. Berg, L. S., 1908. Aral Sea Physico-geographical monograph. Research results of the expedition to Aral Sea. Izvestiya Turkistan. otd. Imp. russ. geogr. ob-va., 5(9): 580 (in Russian).
4. Coulter, G. (Ed.) 1991. Lake Tanganyika and its life. OUP, London, Oxford, New York, 354 pp.