Rudavskaya,V.A. (1966)
Micropaleaephytological characteristics of Lower Palaeozoic deposits of the Markov oil Field [ Mikropaleofitologicheskaya kharakteristika Nizhnepaleozoiskikh otlozhenii Markovskogo Neftyanogo Mestorozhdenioya ] Geologiya i Geofizika
Vol. 9 P. 146- 148