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paleontologicheskiĭ institut (rossiĭskai͡a akademii͡a nauk)
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View Permskie i triasovye tetrapody Vostochnoĭ Evropy By M. F. Ivakhnenko 
Permskie i triasovye tetrapody Vostochnoĭ Evropy
By M. F. Ivakhnenko