Functional morphology of the reproductive system in Cetacea Slijper, E. J. Whales, Dolphins, and Porpoises [Proceedings] (1966) Abstract currently unavailable
Some remarks on gestation and birth in Cetacea and other aquatic mammals Slijper, E. J. Hvalrådets Skrifter: Scientific Results of Marine Biological Research (1956) Excerpt unavailable - partial file available