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, pl. 1–11.