Frederiks, G. N. (1916). Tsirtievidnye spirifery iz permokarbona Bolshezemel'skoi Tundry [Cyrtiform spirifers from the Permian Carboniferous of the Bolshezemelskaya Tundra]. Trudy Geol. Komiteta Nov. Ser. 156: 39-54, plates 3-4.
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Frederiks, G. N.
1916
Tsirtievidnye spirifery iz permokarbona Bolshezemel'skoi Tundry [Cyrtiform spirifers from the Permian Carboniferous of the Bolshezemelskaya Tundra]