Ubaidullaev J.N., Vakhin A.V., Katnov V.E., Trubistina S.A., and Mukhamadiev N.K. “Assessments of Chemical Composition and Properties High-Viscosity Oil Based on Elemental”. Central Asian Journal of Medical and Natural Science 4, no. 5 (October 1, 2023): 332–339. Accessed March 14, 2026. https://www.cajmns.casjournal.org/index.php/CAJMNS/article/view/1826.