1. Biozonation and biochronology of Paleogene calcareous nannofossis from low and middle latitudes;Agnini C;Newsletters on Stratigraphy,2014
2. Stratigraphicheskayay shema morskogo paleogena uga Evropeyskoi Rossii [Marine Paleogene stratigraphic scheme of south European Russia];Akhmetiev MA;Bulletin of Moscow Society of Naturalists. Geological Series,2003
3. Paleocene and Eocene of Western Eurasia (Russian sector) – stratigraphy, palaeogeography, climate;Akhmetiev MA;Neues Jahrbuch für Geologie und Paläontologie Abhandlungen,2004
4. Akhmetiev MA, Shik SM, Alekseev AC, editors. 2015. Unifitsyrovannaya stratigraficheskaya schema paleogenovykh otlozheniy Povolzhsko-Prikaspiyskogo subregiona. Ob’yasnitelnaya zapiska [Standard stratigraphic scheme of the Paleogene deposits in the Volga–Caspian Region. Explanatory note]. Moscow (Russia): VNIGNI; p. 96. Russian.
5. Paleogene of the southwestern Volgograd region (Borehole 13, Gremyach’e Area). 1. Biostratigraphy;Aleksandrova GN;Stratigraphy and Geological Correlation,2011