Vorlage:Obrucheva, 1981

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  • Obrucheva, O.P. 1981. Placoderm Devonian fishes, ptyctodontids. Pp. 155-167 in Menner, V.V. & Druschits, V.V. (eds.): Zakonomernosti istoricheskogo razvitiya iskopaemykh organizmov [= Patterns of Historical Development in Fossil Organisms]. MSU. Moscow. (auf russisch)