Zeitschriftenartikel
Vreys, C.; Schockaert, E. R.; Michiels, N. K.: Formation, transfer, and assimilation of the spermatophore of the hermaphroditic flatworm Dugesia gonocephala (Tricladida, Paludicola). Canadian Journal of Zoology-Revue Canadienne de Zoologie
75 (9), S. 1479 - 1486 (1997)