Reference
Yuri D. Zakharov, Kazushige Tanabe, Peter P. Safronov, Olga P. Smyshlyaeva (2014): New data on microstructure and isotopic composition
of some cephalopods from the Upper Cretaceous of
North America and Europe: significance for oxygen
isotope palaeotemperature measurements – Denisia – 0032: 113 - 132.