1. Materials for fuel-cell technologies;Steele;Nature,2001
2. Emerging membrane for electrochemical systems. I. Solid polymer electrolyte membranes for fuel cell systems;Savadogo;J. New Mater. Electrochem. Syst.,1998
3. Proton-conducting polymer electrolyte membranes based on hydrocarbon polymers;Rikukawa;Prog. Polym. Sci.,2000
4. S.-P.S. Yen, S.R. Narayanan, G. Halpert, E. Graham, A. Yavrouian, US Patent 5,769,496 (1998).
5. F. Helmer-Metzmann, F. Osan, A. Schneller, H. Ritter, K. Ledjeff, R. Nolte, R. Thorwirth, US Patent 5,438,082 (1995).