Lepore, E.; Sciscioli, M.; Mastrodonato, M.; Gherardi, M.; Giangrande, A.; Musco, L. Sperm Ultra-Structure and Spermiogenesis in Syllis Krohni (Polychaeta: Syllidae), With Some Observations on Its Reproductive Biology. Sci. mar. 2006, 70, 585-592.