Jankauskas 1979. Plant microfossils. Urbanek, Adam; Rozanov, Alexei Yu.[Eds]. Upper Precambrian and Cambrian palaeontology of the East-European Platform. Contribution of the Soviet-Polish Working Group on the Precambrian-Cambrian Boundary Problem., Publishing House Wydawnictwa Geologiczne, Warszawa, 1983: 1-158. Chapter pagination: 7-46, 126-147