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Ostrom KM, Simpson TL. (1979). A recent study of calcium and other divalent cations in the release from dormancy of freshwater sponge gemmules. In: Lévi C, Boury-Esnault N (eds) Biologie des Spongiaires. Sponge Biology. Colloques Internationaux du Centre National de la Recherché Scientifique 291, Paris, pp 39-46.