References
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- Vostradovsky, J., 1973: Freshwater fishes. — The Hamlyn Publ. Group Ltd., New York, p. 142.
- Wetzel, R. G., 1976: Limnology. — W. B. Saunders Co., Philadelphia, 743 pp.
- Wetzel, R. G. & Hough, R. A., 1973: Productivity and the role of aquatic macrophytes in lakes: an assessment. — Pol. Arch. Hydrobiol. 20: 9–19.