Kadil'nikova, Y. I. & Moskvin, M. M. 1984. [Danian and Paleocene species of the sea urchins Studeria and Hypsopygaster]. Paleontologicheskii Zhurnal 1984, 37-46.
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Kadilnikova, Y. I.; Moskvin, M. M.
1984
Danian and Paleocene species of the sea urchins Studeria and Hypsopygaster