Volkova 1974. [Acritarcha from the dividing deposits in Lower-Middle Cambrian in western Latvia.] Zhuravleva, I.T.; Rozanov, A.Yu.[Eds]. [Biostratigraphy and palaeontology of the Lower Cambrian of Europe and north Asia.], Nauka, Moscow, 1974: 124-137. Chapter pagination: 194-198