LEFKADITOU, E., and P. BEKAS. “Analysis of Beak Morphometry of the Horned Octopus Eledone Cirrhosa (Cephalopoda: Octopoda) in the Thracian Sea (NE Mediterranean)”. Mediterranean Marine Science, vol. 5, no. 1, June 2004, pp. 143-50, doi:10.12681/mms.219.