A. S.  Rewar, Chaudhari, H. D., Illathvalappil, R., Sreekumar, K., and Kharul, U. K., ?New approach of blending polymeric ionic liquid with polybenzimidazole (PBI) for enhancing physical and electrochemical properties?, Journal of Materials Chemistry A, vol. 2, no. 35, pp. 14449-14458, 2014.