Pershina 1987. [New phyllocarids (Crustacea) from the Upper Silurian and Devonian of the Timan-Pechorsk oil & gas province.] Molin, V.A.; Guskov, V.A.; Borintseva, N.A.[Eds]. Stratigrafiya i paleogeografiya fanerozoya evropeiskogo Severo-Vostoka SSSR. [Stratigraphy and paleogeography of the Phanerozoic of European North-East USSR.], Komi Scientific Centre, Syktyvkar, 1987: 37-39. Chapter pagination: 37-39