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Mamkaev, Y. V.; Kostenko, A. G. (1991). On the phylogenetic significance of sagittocysts and copulatory organs in acoel turbellarians. Hydrobiologia. 227(1): 307-314.
Mamkaev, Y. V.; Kostenko, A. G. (1991). On the phylogenetic significance of sagittocysts and copulatory organs in acoel turbellarians. Hydrobiologia. 227(1): 307-314.
