Purnama, Herry, Indra Viki Hartoko, Muhammad Mujiburohman, and Nur Hidayati. “Effect of Graphene Oxide on the Characteristics of SPEEK-Chitosan Membranes for Direct Methanol Fuel Cells”. Automotive Experiences 3, no. 1 (April 6, 2020): 1–5. Accessed October 12, 2026. https://journal.unimma.ac.id/AutomotiveExperiences/article/view/3039.