Fischer, J. & Leipner, A. & Hartkopf-Froder, C. & Schneider, J.W. & Wittry, J. & Sowiak, M. (2015)
Pennsylvanian chondrichthyan egg capsules from the Piesberg quarry, Northwest Germany [Abstract].
In PalGes 2015 14.–16. September 2015 Schiffweiler–Reden, Germany