Hofmann, H. J., and Jackson, G. E., 1991- Shelf- Facies microfossils from the Uluksan Group (Proterozoc Bylot supergroup) Baffin Island, Canada. Journal of Paleontology, 65: 361-382.
Hofmann, H.J., and Jackson, G. E., 1994- Shale facies microfossils from the Proterozoic Bylot Supergroup, Baffin Island Canada. Journal of Paleontology, 68 (4): 1-35.
Stocklin, J., and Setudehnia, A., 1972- Lexique stratigraphic international, Viii Asie Fascicule 9 b Iran, 376 pp.
Stocklin, J., Nabavi, M., and Ruttner, A. 1964- New data on the lower Paleozoic and Pre- Cambrian of North Iran. Geol. Surv. Iran, Rep. no. 1, 29pp.
Stocklin, J., Nabavi, M., and Samimi, M., 1965- Geology and mineral resourses of the Soltanieh Mountains (northwest Iran). Geol. Surv. Iran, Rep. no. 3, 69pp.
Vidal, G., 1981- Micropalaeontology and biostratigraphy of the Upper Proterozoic and Lower Cambrian sequence in East- Finnmark, northern Norway. Norges Geologiske Undersokelse, no. 362, 53pp.
Vidal, G., and Siedlecka, A., 1983- Planktonic acid-resistant microfossils from the Upper Proterozoic strata of the Barents Sea region of Varanger Peninsula, East Finnmark, northern Norway. Norges Geologiske Undersokelse, no. 382: 49-79.
Xing, Y. Sh., et al., 1985- Late Pre- Cambrian palaeontology of China, geological publishing House, Beijing. Ministry of geology and mineral resources, Geological Memoirs, Series no. 2, 288pp.
Yankauskas, T. V., 1979- Nizhnerifeyskie microbioty Yuzhnogo Urala (lower Riphean microbiotas of southern Urals) Akademiya Nauk S.S.S.R. Doklady, 247 (6): 1465- 1467.