“Sulfonated PEI Membrane With GPTMS-TiO2 As a Filler for Potential Direct Methanol Fuel Cell (DMFC) Applications”. Malaysian Journal of Fundamental and Applied Sciences 15, no. 4 (August 25, 2019): 555–560. Accessed September 7, 2026. https://mjfas.utm.my/index.php/mjfas/article/view/1216.