HUSSAIN, S.; MALIK, A. A.; SHAHZAD, K.; AKHTHAR, N. A.; ALI, N.; CHUGHTAI, A. Factors Influencing the Formation of Producer gas from Coal and Biomass; A Review. Journal of the Pakistan Institute of Chemical Engineers, [S. l.], v. 43, n. 2, p. 133–147, 2015. Disponível em: http://piche.org.pk/journal/index.php/jpiche/article/view/197. Acesso em: 29 mar. 2024.