Rahman, M. M., Akter, M. ., Siddik, A. B. ., Islam, M. W. ., Afrin, S. ., Afroze, M. ., Khan, M. ., Hoque, M. A. . and Mamun, M. A. (2024) “Purification of waste engine oil using raw clay, acid treated clay and clay/activated charcoal”, Journal of Bangladesh Academy of Sciences, 48(1), pp. 121–134. doi: 10.3329/jbas.v48i1.70241.