Ismail, A. F., Othman, N. H., & Mustafa, A. (2009). Sulfonated polyether ether ketone composite membrane using tungstosilicic acid supported on silica-aluminium oxide for direct methanol fuel cell (DMFC). Elsevier BV.

Ismail, Ahmad Fauzi, N. H. Othman, and A. Mustafa. Sulfonated Polyether Ether Ketone Composite Membrane Using Tungstosilicic Acid Supported On Silica-aluminium Oxide for Direct Methanol Fuel Cell (DMFC). Elsevier BV, 2009.

Ismail, Ahmad Fauzi, N. H. Othman, and A. Mustafa. Sulfonated Polyether Ether Ketone Composite Membrane Using Tungstosilicic Acid Supported On Silica-aluminium Oxide for Direct Methanol Fuel Cell (DMFC). Elsevier BV, 2009.