V. G. Suyarko, L. V. Ishchenko, A. M. Yerofieiev, V. V. Sukhov, and Y. S. Shmorh, “Heavy metals in oils and formation of bitumen-hydrothermal associations in the rocks of the Dnieper-Donetsk paleorift”, GGE, no. 52, pp. 93-102, Jul. 2020.