Reference

Carmen Mariana Chira, Doru Toader Juravle, Alin Igritan, Mirela Violetta Popa, Peter Zsolt Fodor (2011): The calcareous nannofossils across the Cretaceous-Paleogene boundary in northern Romania (Bucovina and Maramures) – Berichte der Geologischen Bundesanstalt – 85: 51.