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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., ?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 S. C.  Kumbharkar and Kharul, U. K., ?New N-substituted ABPBI: synthesis and evaluation of gas permeation properties?, Journal of Membrane Science, vol. 360, no. 1-2, pp. 418-425, 2010.\par \par }