Migom, F. & Christiaens, Y. & Deceuckeleire, M. (2021)
The Lower Eocene (Ypresian) Chondrichthyes from Egem, Belgium. Part 1, Orders: Hexanchiformes, Squaliformes, Squatiniformes, Heterodontiformes and Orectolobiformes.
Palaeo Ichthyologica, 15, 1–55