Oreshkina et al., 2015
From dinoflaj3
Oreshkina, T.V., Iakovleva, A.I. and Shcherbinina, E.A., 2015: Micropaleontological analysis of Eocene sediments from eastern pre-Caspian region (Bore-hole no, 57, Shubarsay Mould, Kazachstan. Bulletin of the Moscow Society of Naturalists. Geological Series, v.90, no.1, p.42-80. [in Russian].