“Preparation and characterization of sulfonated polyether ether ketone membranes for fuel cell applications: A comparison with Nafion® membranes”, JPIChE, vol. 42, no. 1, pp. 55–62, Jul. 2014, Accessed: Aug. 12, 2026. Available: https://www.piche.org.pk/journal/index.php/jpiche/article/view/147