Chen, X., Lu, H., Liu, B., Chen, Y., Li, S. and Jin, M. (2012) “Species identification of Ommastrephes bartramii, Dosidicus gigas, Sthenoteuthis oualaniensis and Illex argentinus (Ommastrephidae) using beak morphological variables”, Scientia Marina, 76(3), pp. 473–481. doi: 10.3989/scimar.03408.05B.