Reference

Willemijn Quaijtaal, Bridget S. Wade, Stefan Schouten, Alexander J. P. Houben, Yair Rosenthal, Kenneth G. Miller, Henk Brinkhuis (2011): Environmental- and sea-level change revealed by dinoflagellate cysts during the Eocene-Oligocene transition at St. Stephens Quarry, Alabama, USA – Berichte der Geologischen Bundesanstalt – 85: 134.