Hussein, Amel, and Saad khudhair. “Biological Treatment of Used Engine Oil by Single and Mixed Bacterial Cultures Isolated from Soil of Mechanic Workshops”. Journal of Biotechnology Research Center (JOBRC) 12, no. 1 (January 1, 2018): 115–123. Accessed November 23, 2024. https://jobrc.org/index.php/jobrc/article/view/556.