Reference
Ana-Voica Bojar, Hartmut R. Hiden, Alois Fenninger, Franz Neubauer (2002): Middle Miocene seasonal temperature changes in the Styrian Basin as
recorded by the isotopic composition of Pectinide and Brachiopod shells – Berichte des Institutes für Geologie und Paläontologie der Karl-Franzens-Universität Graz – 6: 7 - 8.