Greyling, E. H. & Cooper, M. R. 1995. Two new irregular echinoids from the Upper Cretaceous (mid-Campanian) of Angola. Durban Museum Novitates 20, 63-71.
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Greyling, E. H.; Cooper, M. R.
1995
Two new irregular echinoids from the Upper Cretaceous (mid-Campanian