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Castro P. (1979). Studies on the symbiosis between a filamentous microorganism and Hymenamphiastra cyanocrypta, a sponge from California. In: Lévi C, Boury-Esnault N (eds) Biologie des Spongiaires. Sponge Biology. Colloques Internationaux du Centre National de la Recherché Scientifique 291, Paris, pp 365-371.