1. Upper Paleozoic deposits of the Western Verkhoyansk;Andrianov,1966
2. Permian and some Carboniferous ammonoids of North-East of Asia (Russia);Andrianov,1985
3. Permian history of Arctic North America;Beauchamp,1995
4. Permian rock sequences of the Balygychan Uplift;Biakov,2004
5. Permian bivalve mollusks of Northeast Asia;Biakov;Journal of Asian Earth Sciences,2006