A. MOHAMMED, Abdul-Halim; J. YASS KHEDER, Mohammed. The Effect of Extraction Temperature and Solvent to Oil Ratio on Viscosity Index of Mixed-medium Lubricating Oil Fraction by Using Solvents Extraction. Iraqi Journal of Chemical and Petroleum Engineering, Baghdad, Iraq., v. 10, n. 2, p. 13–18, 2009. DOI: 10.31699/IJCPE.2009.2.3. Disponível em: https://ijcpe.uobaghdad.edu.iq/index.php/ijcpe/article/view/402.. Acesso em: 10 may. 2024.