1. Brod, I.O. and Uspenskaya, N.Yu., Oil fields in the Dagestan ASSR, in Neftyanaya ekskursiya: Dagestanskaya i Checheno-Ingushskaya ASSR (Oil Excursion: Dagestan and Chechen-Ingush ASSR), Moscow, 1937, pp. 5–38 (Materials of IGC, no. 3).
2. Gadzhiev, A.N. and Popkov, V.I., New data on geology of the middle Caspian region, Dokl. SSSR. 1988, vol. 299, no. 3, pp. 682–685.
3. Gavrilov, Yu.O., Shchepetova, E.V., Shcherbinina, E.A., Golovanova, O.V., Nedumov, R.I., and Pokrovsky, B.G., Sedimentary environments and geochemistry of Upper Eocene and Lower Oligocene rocks in the northeastern Caucasus, Lith. Miner. Resourc., 2017, no. 6, pp. 447–466.
4. Grossgeim, V.A., Paleogen Severo-Zapadnogo Kavkaza (Paleogene in the NW Caucasus), Moscow: Gostekhizdat, I960, 3–190.
5. Kozmodem’yanskii, V.V., Popkov, V.I., and Titov, B.I., Oligocene lateral overgrowths in Mangyshlak, Byull. MOIP. Otd.
Geol., 1987, vol. 62, no. 1, pp. 37–40.