I. T. Zhuravleva, N. M. Zadorozhnaya, D. V. Osadchaya, N. V. Pokrovskaya, N. M. Rodionova and V. D. Fonin. 1967. Fauna Nizhnego Kembriya Tuvy (Opornyy Razrez R. Shivelig-Khem) [Fauna of the Lower Cambrian of Tuva (Key Section, River Shivelig-Khem)]. USSR Academy of Sciences Siberian Division Institute of Geology and Geophysics Ministry of Geology and USSR 181:1-39 [P. Wagner/P. Wagner]