Geys, J. F. (1989). Hemicidaroid echinoids 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, 59: 127-135
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Geys, J. F.
1989
Hemicidaroid echinoids 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