| author | date | title | journal / publication | Souza ST, Leal-Zanchet AM | 2002 | abs. | Histological and histochemical aspects of the penial glands of Girardia biapertura Sluys, 1997 (Platyhelminthes, Tricladida, Paludicola). | Brazilian Journal of Biology 62(3):547-555 |
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