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Van de Vyver, G.; De Vos, L. (1979). Structure of a non-merging front between two fresh-water sponges Ephydatia fluviatilis belonging to different strains. In: Lévi C, Boury-Esnault N (eds) Biologie des Spongiaires. Sponge Biology. Colloques Internationaux du Centre National de la Recherché Scientifique. 291: 233-237.