Wan Azelee, W. A. B., Othman, M. Y., Ali, R., Ching, K. Y., & Mohd. Nasir, J. (2009). Titanium and copper oxide based catalysts for the in-situ reactions of methanation and desulfurization in the removal of sour gases from simulated natural gas. Ibnu Sina Institute for Fundamental Science Studies, Universiti Teknologi Malaysia.

Wan Azelee, Wan Abu Bakar, Mohd. Yusuf Othman, R. Ali, Kuan Yong Ching, and Junaidi Mohd. Nasir. Titanium and Copper Oxide Based Catalysts for the In-situ Reactions of Methanation and Desulfurization in the Removal of Sour Gases From Simulated Natural Gas. Ibnu Sina Institute for Fundamental Science Studies, Universiti Teknologi Malaysia, 2009.

Wan Azelee, Wan Abu Bakar, et al. Titanium and Copper Oxide Based Catalysts for the In-situ Reactions of Methanation and Desulfurization in the Removal of Sour Gases From Simulated Natural Gas. Ibnu Sina Institute for Fundamental Science Studies, Universiti Teknologi Malaysia, 2009.