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Utinomi, H. 1953. A check list of echinoids found in the Kii region. Publications of the Seto Marine Biological Laboratory 3: 339-358, 1 fig

Utkina, N. K. and Denisenko, V. A. 2007. Ophiuroidine, the first indolo[2,1b]quinazoline alkaloid from the Caribbean brittle star Ophiocoma riisei. Tetrahendron Letters, 48:4445-4447. (restricted access)