Carter, B.D. & Beisel, T.H. (1987). "Cassidulus trojanus" belongs in the genus Eurhodia (Echinoidea) based upon new criteria. Journal of Palaeontology. 61: 1081-1083.
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Carter, B.D. & Beisel, T.H.
1987
"Cassidulus trojanus" belongs in the genus Eurhodia (Echinoidea) based upon new criteria