1. Bidder AM (1950) The digestive mechanism of the European squids Loligo vulgaris, Loligo forbesi, Alloteuthis media and Alloteuthis subulata. Q J Microsc Sci 91:1–43
2. Bizikov VA (1987) New data on squid gladius structure. Zool Zhur 46(2):177–184
3. Boletzky SV (1973) Structure and function of the Kölliker organs in young octopods (Mollusca, Cephalopoda). Z Morphol Tiere 75:315–327
4. Boletzky SV (1983) Sepia officinalis. In: Boyle PR (ed) Cephalopod life cycles, vol 2 Species accounts. Academic Press, San Diego, pp 31–52
5. Boletzky SV, Wiedmann J (1978) Schlup-Wachstum bei Sepia officinalis in Abhängigkeit von ökologischen Parametern. Neues Jahrb Geol P-A 157:103–106