Joris F Geys (1981)
Regular echinoids from the Turonian and the Coniacian (Upper Cretaceous) of the Mons basin (Belgium)
Bulletin de l'Institut royal des Sciences naturelles de Belgique,Sciences de la Terre, vol. 53,3 p. 20 p.,4 pl.
18313, 124, 140, 152, Ht, HAINE, CRET, PAL
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