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2. Gray, J., "Studies in Animal Locomotion. VI. The Propulsive Powers of the Dolphin", J. Exp. Biol., 13, 192 (1936).
3. Shoulejkin, W. W., "Physics of the Sea", Publication Acad. Sci U.S.S.R., Moscow-Leningrad, see pp. 715–724 (1941).