Egoian 1989. [New ammonites from deposits of the Lower Barremian of western Caucasus.] Smirnova, T.N.[Ed]. Paleontologicheskii metod v prakticheskoi stratigrafii. [Palaeontological methodology in practical stratigraphy.], Institute of Geology & Fossil Fuels, Moscow, 1989: 23-31, 147-149, 159. Chapter pagination: 135-145, 156-157, 163