Nerodenko 1983. Early Cretaceous belemnites from the south of the U.S.S.R. Starobogatov, Ya.I.; Nesis, K.N.[Eds]. Taxonomy and ecology of Cephalopoda. Scientific papers., USSR Acad. Sci., Zool. Inst., Leningrad, 1983: 113-114. Chapter pagination: 42-43