D. CUCCU, M. MEREU, C. PORCU, M. FOLLESA, A. CAU, and A. CAU, “Development of sexual organs and fecundity in Octopus vulgaris Cuvier, 1797 from the Sardinian waters (Mediterranean Sea)”, Mediterr. Mar. Sci., vol. 14, no. 2, pp. 270–277, May 2013.