Butt , Saad. 2016. “Catalytic Oxidation of CO and CH4 over Hexaaluminate Based Catalysts : Catalytic Oxidation of CO and CH4 over Hexaaluminate Based Catalysts ”. Proceedings of the Pakistan Academy of Sciences: B. Life and Environmental Sciences 53 (4):323-35. https://www.ppaspk.org/index.php/PPAS-B/article/view/274.