Tileuberdi, Y., Y. Akkazin, L. Azylbek, K. Zhanbekov, Y. Imanbayev, U. Kuoshiken, and A. Yermekova. “Studying Group Composition of Natural Bitumen of the Beke Oil Sands”. Combustion and Plasma Chemistry, vol. 21, no. 3, Oct. 2023, pp. 209-16, doi:10.18321/cpc21(3)209-216.