Vorlage:Obruchev, 1968

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  • Obruchev, D.V. 1968. Ob evolyutsii Heterostraci [On the evolution of Heterostraci]. Pp. 21–23 in Obruchev, D.V. (ed.): Essays on phylogeny and taxonomy of fossil fishes and agnathans. Nauka, Moscow.