Ubaidullaev J.N., Vakhin A.V., Katnov V.E., Trubistina S.A., and Mukhamadiev N.K. 2023. “Assessments of Chemical Composition and Properties High-Viscosity Oil Based on Elemental”. Central Asian Journal of Medical and Natural Science 4 (5), 332-39. https://cajmns.centralasianstudies.org/index.php/CAJMNS/article/view/1826.