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S. C.  Kumbharkar, Islam, M. Nazrul, Potrekar, R. A., and Kharul, U. K., ?Variation in acid moiety of polybenzimidazoles: investigation of physico-chemical properties towards their applicability as proton exchange and gas separation membrane materials?, Polymer, vol. 50, no. 6, pp. 1403-1413, 2009.\par \par }