↑Betekhtina, O. A.; Soukhov, S. V. (1968) Fauna i flora verkhnepaleozoiskikh otlozhenii Gorlovskogo Basseina [Fauna and flora from the upper Paleozoic deposits in Gorlov Basin]. Akademiia Nauk SSSR, Sibirskoe Otdelenie, Institut Geologii i Geofiziki, Trudy [Academy of Sciences of USSR, Siberian Branch, Institute of Geology and Geophysics, Transactions]. 23:1–140, 36 pl.