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S. C.  Kumbharkar, Karadkar, P. B., and Kharul, U. K., ?Enhancement of gas permeation properties of polybenzimidazoles by systematic structure architecture?, Journal of Membrane Science, vol. 286, no. 1-2, pp. 161-169, 2006.\par \par S. C.  Kumbharkar and Kharul, U. K., ?N-substitution of polybenzimidazoles: synthesis and evaluation of physical properties?, European Polymer Journal, vol. 45, no. 12, pp. 3363-3371, 2009.\par \par S. C.  Kumbharkar and Kharul, U. K., ?Investigation of gas permeation properties of systematically modified polybenzimidazoles by N-substitution?, Journal of Membrane Science, vol. 357, no. 1-2, pp. 134-142, 2010.\par \par R. S.  Bhavsar, Kumbharkar, S. C., and Kharul, U. K., ?Investigation of gas permeation properties of film forming polymeric ionic liquids (PILs) based on polybenzimidazoles?, Journal of Membrane Science, vol. 470, pp. 494-503, 2014.\par \par }