1. Abuzyarova, R.Ya., Palynological data to the Eocene flora of Kazakhstan, in Tr. Pervoi Mezhd. palinol. konf., Tucson, USA. Dokl. sov. palinologov (Proc. Ist Int. Palynol. Conf., Tucson, USA. Reports of Soviet Palynologists), Moscow: Izd. Akad. Nauk SSSR, 1962, pp. 120–125.
2. Akhmetiev, M.A. and Zaporozhets, N.I., Pollen, spores, plant macrofossils and phytoplankton of the upper Eocene and Oligocene in the stratotypes of the Cheganskaya and Asheayrikskaya Formations (Northern Ustyurt, Kazakhstan), Byull. Mosk. O-va Ispyt. Prir.,Otd. Geol., 1992, vol. 67, no. 3, pp. 96–105.
3. Andreeva-Grigorovich, A.S., Phytoplankton-based (dynocysts and nannoplankton) zonal Paleogene stratigraphy of the south of the USSR, Extended Abstract of Doctoral (Geol.-Mineral.) Dissertation, Kiev: Inst. Geol. Nauk AN USSR, 1991.
4. Andreeva-Grigorovich, A.S., Zaporozhets, N.I., Shevchenko, T.V., Aleksandrova, G.N., Vasil’eva, O.V., Iakovleva, A.I., Stotland, A.B., and Savitskaya, N.A., Atlas dinotsist paleogena Ukrainy, Rossii i sopredel’nykh stran (Atlas of Dinocysts of Ukraine, Russia and adjacent countries), Kiev: Nauk. Kn., 2011 [in Russian].
5. Aristova, K.E., Pollen and microplankton from the Eocene–Oligocene boundary deposits of North Aral Region, Ustyurt, Crimea and their stratigraphic significance, Byull. Mosk. O-va Ispyt. Prir.,Otd. Geol., 1971a, vol. 46, no. 2, pp. 96–105.