1. Amrem, H., 1964. Ecological and taxonomical studies on zooplankton from Spitsbergen. Zool. Bidr. Upps. 36: 209?276.
2. Begon, M., J. L. Harper & C. R. Townsend, 1990. Ecology: individuals, populations and communities. Blackwell Scientific Publications, Oxford, 945 pp.
3. Birky, C. W. & J. J. Gilbert, 1971. Parthenogenesis in rotifers: The control of sexual and asexual reproduction. Am. Zool. 11: 245?266.
4. Buchner, H., 1987. Studies on the control of heterogonous reproduction in Rotifers. III. The loss of mictic potential in Brachionus urceolaris. Arch. Hydrobiol. 109: 333?354.
5. Carlin, B., 1943. Die Planktonrotatorien des Motalastr�m. Medd. Lunds Univ. Limnol. Inst 17: 1?163.