JANSSEN, A.W. & VAN DEN BOSCH, M. & VON DER HOCHT, F. (1988)
Age determination of a Tertiary deposit at Kervenheim in the Lower Rhine District, in connection with the find of a whale skeleton (F.R.G., Nordrhein-Westfalen). Rijksmuseum van Geologie en Mineralogie, 124: 1–8, 1 fig., 2 tabs.