Shmidt, O. I. & Simakov, S. N. 1953. [Late Cretaceous sea urchins from south-eastern Middle Asia]. Trudy Vsesoyuznogo Neftyanogo Nauchno-Issledovatel'skogo Geologo-Razvedochnogo Instituta (N.S.) 66, 5-75.
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Shmidt, O. I.; Simakov, S. N.
1953
Late Cretaceous sea urchins from south-eastern Middle Asia]. Trudy Vsesoyuznogo Neftyanogo Nauchno-Issledovatel'skogo Geologo-Razvedochnogo