%0 conference lecture %@ %A Roeder, J., Gomes, D., Ponce, M.L., Abetz, V., Pereira Nunes, S. %D 2007 %J Fuel Cells 2007, Advances in Materials for Proton Exchange Membrane Fuel Cell Systems %T Sulfonated Polyoxazoles Membranes for Fuel Cell Application: Acid Protonation Effect on Conduction Properties %U %X