Preparation of Sulfonated Poly (ethylene-co-tetrafluoroethylene-graft-styrene) Based Polymer Electrolyte Membranes for Fuel Cell by using Gamma Irradiation Technique - Suliwarno, A.; Center for the Application of Isotopes and Radiation Technology, National Nuclear Energy Agency Jl. Lebak Bulus Raya No. 49, Jakarta 12440, Indonesia (PPIKSN-BATAN, 2012)