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Balashov Z.G. (1961). Систематика и филогения эндоцератоидей [Systematics and phylogeny of Endoceratoidea]. Paleontologicheskiy Zhurnal. No. 1. P. 23-37. [In Russian].
Balashov Z.G. (1961). Систематика и филогения эндоцератоидей [Systematics and phylogeny of Endoceratoidea]. Paleontologicheskiy Zhurnal. No. 1. P. 23-37. [In Russian].
