Moskvin, M. M. 1964. [Echinoids of the genus Protobrissus from the Danian and Paleocene sediments of the USSR]. Pp. 185-202 in Sbornik v chest' akademika Y. S. Yovcheva Sofia.
176011
Moskvin, M. M.
1964
Echinoids of the genus Protobrissus from the Danian and Paleocene sediments of the USSR