Undulatory movement
Schäfer, W. (1972). Undulatory movement, in: Schäfer, W. et al. Ecology and palaeoecology of marine environments. pp. 198-201
In: Schäfer, W.; Oertel, I.; Craig, G.Y. (1972). Ecology and palaeoecology of marine environments. Oliver & Boyd: Edinburgh. ISBN 0-05-002127-3. XII, 568 pp., meer
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