Chen, X.; Lu, H.; Liu, B.; Chen, Y.; Li, S.; Jin, M. Species Identification of Ommastrephes Bartramii, Dosidicus Gigas, Sthenoteuthis Oualaniensis and Illex Argentinus (Ommastrephidae) Using Beak Morphological Variables. Sci. mar. 2012, 76, 473-481.