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Costello, H. M.; Costello, D. P. (1938). Copulation in the acoelous turbellarian Polychoerus carmelensis. Biological Bulletin. 75: 85-98.
Costello, H. M.; Costello, D. P. (1938). Copulation in the acoelous turbellarian Polychoerus carmelensis. Biological Bulletin. 75: 85-98.