Valkov A.K. (1987). Biostratigrafyia nizhnego kembriya vostoka Sibirskoy Platformy; Yudomo-Olenkskiy region [= Biostratigraphy of the Lower Cambrian of the east of the Siberian Platform: Yudomo-Olekma region]. Moscow: Nauka. 136 pp. [in Russian].
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Valkov A.K.
1987
Biostratigrafyia nizhnego kembriya vostoka Sibirskoy Platformy; Yudomo-Olenkskiy region [= Biostratigraphy of the Lower Cambrian of the east of the Siberian Platform: Yudomo-Olekma region]