Sigwadi, Rudzani A, Sipho E Mavundla, Nosipho Moloto, and Touhami Mokrani. “Synthesis of Zirconia-Based Solid Acid Nanoparticles for Fuel Cell Application”. Journal of Energy in Southern Africa 27, no. 2 (July 20, 2016): 60–67. Accessed July 3, 2024. https://journals.assaf.org.za/index.php/jesa/article/view/1342.