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Gallissian, M.-F.; Vacelet, J. (1992). Ultrastructure of the oocyte and embryo of the calcified sponge, Petrobiona massiliana (Porifera, Calcarea). Zoomorphology. 112: 133-141.
Gallissian, M.-F.; Vacelet, J. (1992). Ultrastructure of the oocyte and embryo of the calcified sponge, Petrobiona massiliana (Porifera, Calcarea). Zoomorphology. 112: 133-141.
