Jagt, J.W.M. & Motchurova-Dekova, N. & Ivanov, P. & Cappetta, H. & Schulp, A.S. (2006)
Latest Cretaceous mosasaurs and lamniform sharks from Labirinta cave, Vratsa district (northwest Bulgaria): a preliminary note.
Annales Géologiques de la Péninsule Balkanique, 67: 51–63