Malinowski, M., and A. Iwan. “Polymer Fuel Cells. Part I. Principle of Operation, Types and Methods of Investigations”. Polimery 59, no. 6 (June 30, 2014): 451–458. Accessed January 15, 2025. https://polimery.ichp.vot.pl/index.php/p/article/view/648.