Geys, J. F. 1987. The genus Typocidaris (Cidaroida; Echinoidea) in the Upper Cretaceous of the Maastricht area (Belgium and the Netherlands). Bulletin de l'Institut Royal des Sciences naturelles de Belgique - Sciences de la Terre 57, 201-215.
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Geys, J. F.
1987
The genus Typocidaris (Cidaroida; Echinoidea) in the Upper Cretaceous of the Maastricht area (Belgium and the Netherlands)
Bulletin de l'Institut Royal des Sciences naturelles de Belgique - Sciences de la Terre