ASIF, M.; HUSSAIN, M. A.; RIAZ, A.; MUJAHID, R.; AKRAM, M. S.; HAIDER, B.; KANWAL, S.; ZEB, H. A physical coal cleaning approach for clean energy production from low grade Lakhra coal of Pakistan using diester table. Journal of the Pakistan Institute of Chemical Engineers, [S. l.], v. 51, n. 2, 2023. DOI: 10.54693/piche.05121. Disponível em: https://www.piche.org.pk/journal/index.php/jpiche/article/view/557. Acesso em: 31 oct. 2025.