Obut, A. M.; Sennikov, N.V.; Zaslavskaya, N. M. (1984). Siberian graptolite and chintinozoa assemblages at Cambrian - Ordovician boundary. Soviet Geology and Geophysics (Geology and Geophysics). 25(3): 3-7.
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Obut, A. M.; Sennikov, N.V.; Zaslavskaya, N. M.
1984
Siberian graptolite and chintinozoa assemblages at Cambrian - Ordovician boundary
Soviet Geology and Geophysics (Geology and Geophysics)