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Castiello D, Cimino G, De Rosa S, De Stefano S, Izzo G, Sodano G. (1979). Studies on the chemistry of the relationship between the opisthobranch peltodoris astromaculata and the sponge Petrosia ficiformis. In: Lévi C, Boury-Esnault N (eds) Biologie des Spongiaires. Sponge Biology. Colloques Internationaux du Centre National de la Recherché Scientifique 291, Paris, pp 413-416.