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Reference

Helmuth [Helmut] Zapfe, J.A. Jeletzky (1967): Coleoid and Orthocerid Cephalopods of the Rhaetian Zlambach Marl from the Fischerwiese near Aussee, Styria (Austria). (Tafel 1-4) – Annalen des Naturhistorischen Museums in Wien – 71: 69 - 106.