R. A.  Potrekar, Kulkarni, M. P., Kulkarni, R. A., and Vernekar, S. P., ?Polybenzimidazoles tethered with N-Phenyl 1,2,4-triazole units as polymer electrolytes for fuel cells?, Journal of Polymer Science Part A-Polymer Chemistry, vol. 47, no. 9, pp. 2289-2303, 2009.