Geys, J. F. 1992. Regular echinoids, other than Hemicidaroida, from Upper Cretaceous deposits in the Wadi Qena-area (Eastern Desert, Egypt). Bulletin de l'Institut Royal des Sciences naturelles de Belgique - Sciences de la Terre 62, 139-154.
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Geys, J. F.
1992
Regular echinoids, other than Hemicidaroida, from Upper Cretaceous deposits in the Wadi Qena-area (Eastern Desert, Egypt)
Bulletin de l'Institut Royal des Sciences naturelles de Belgique - Sciences de la Terre