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Bavestrello, G.; Bonito, M.; Sarà, M. (1993). Silica content and spicule size variation during an annual cycle in Chondrilla nucula Schmidt (Porifera, Demospongiae) in the Ligurian Sea. In: Uriz MJ, Rützler K (eds) Recent advances in ecology and systematics of sponges. Scientia Marina. 57: 421-425.