Hovestadt, D.C. & Hovestadt-Euler, M. (1995)
Additions to the fauna of the Boom Clay Formation of Belgium (Rupelian, Oligocene). Taxonomic adjustments on the Scyliorhinidae and Rajoidei, discovery of a dasyatid species (Pisces, Chondrichthyes) and of a curculionid species (Insecta, Coleoptera). Belgian Geological Survey, Professional Paper, Elasmobranches et Stratigraphie, 278, 261–282