NAEEM, M. H.; KHAN, N. A.; SYED, N. U. H.; SAIRA BANO; MUDDASAR HABIB. An alternate acid cleaning process for the regeneration of waste engine oil and a proposed procedure for the disposal of produced sludge. Journal of the Pakistan Institute of Chemical Engineers, [S. l.], v. 51, n. 1, 2023. DOI: 10.54693/piche.05116. Disponível em: https://www.piche.org.pk/journal/index.php/jpiche/article/view/567. Acesso em: 31 oct. 2025.