Guangul, Fiseha M., and Girma T. Chala. “A Comparative Study between the Seven Types of Fuel Cells”. Applied Science and Engineering Progress 13, no. 3 (July 21, 2020): 185–194. accessed August 28, 2026. https://ph02.tci-thaijo.org/index.php/ijast/article/view/241537.