Ilyina et al., 1994
From dinoflaj3
Ilyina, V.I., Kulkova, I.A. and Lebedeva, N.K., 1994: Microphytofossils and detail stratigraphy of marine Mesozoic and Cenozoic of Siberia. Mikrofitofossilii i detalnaya stratigrafiya morskogo i kainozoya Sibiri. Russian Academy of Sciences, Siberian Branch, United Institute of Geology, Geophysics and Mineralogy, Transactions, Issue no.818, p.1-192, pl.1-56. (In Russian with English abstract.)