1. V. N. Andrianov, Upper Paleozoic Deposits of the Western Verkhoyansk Region (Tom-Echii Interfluve) (Nauka, Moscow, 1966) [in Russian].
2. M. M. Astafieva, Permian Inoceramus-Like Bivalves of Russia (Nauka, Moscow, 1993) [in Russian].
3. M. M. Astafieva and K. A. Astafieva-Urbajtis, “Stages in the Evolution of the Permian Bivalves of the Boreal Realm,” in Permian System: Problems of Stratigraphy and Evolution of Organic World (Kazan. gos. un-t, Kazan, 1988), pp. 3–11 [in Russian].
4. A. S. Biakov, “Stratigraphic Significance of Permian Inoceramus-Like Bivalves of Northeastern USSR,” in Stratigraphy and Paleontology of the Phanerozoic of Northeastern USSR (SVKNII DVNTs AN SSSR, Magadan, 1988), pp. 60–65 [in Russian].
5. A. S. Biakov, “Beds with Fauna and Bivalve Assemblages from Permian Reference Sections of the Southeastern Omolon Massif,” in Proceedings on Geology and Minerals of Northeastern USSR (Kn. izd-vo, Magadan, 1991), Vol. 27, pp. 122–128 [in Russian].