Ahmad Kamaroddin , Mohd Fadhzir, et al. “Effect of Temperature and Current Density on Hydrogen Production for Polybenzimidazole Zirconium Phosphate Hybrid Membrane in Copper Chloride Electrolysis”. International Journal of Integrated Engineering, vol. 11, no. 7, Nov. 2019, pp. 182-9, https://publisher.uthm.edu.my/ojs/index.php/ijie/article/view/4641.