“Composite Proton Electrolyte Membranes C Poly Ether-Ether Ketone (SPEEK) at Various Amount of Mesoporous Phosphotungstic Acid (mPTA) for Hydrogen Fuel Cell Application”. 2020. Journal of Applied Membrane Science & Technology 24 (3). https://doi.org/10.11113/amst.v24n3.185.