Yankauskas,T.V. (1974)
Paleontological Base for the geological dating of the Izhorian Suite of the Cambrian in the Russian Platform [ Paleontologicheskoe Oboshovanie Geologicheskogo Vorasta Izhorskoi Svite Kembriya Russkoi Platformy ] Izvestiya Akademii Nauk SSSR, Seriya Geologicheskaya
Vol. 1974 # 1 P. 85- 91