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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 M. P.  Achalpurkar, Kharul, U. K., Lohokare, H. R., and Karadkar, P. B., ?Gas permeation in amine functionalized silicon rubber membranes?, Separation and Purification Technology, vol. 57, no. 2, pp. 304-313, 2007.\par \par P. B.  Karadkar, Kharul, U. K., Bhole, Y. S., Badhe, Y. P., Tambe, S. S., and Kulkarni, B. D., ?Gas sorption and transport in polyarylates: effect of substituent symmetry and polarity?, Journal of Membrane Science, vol. 303, no. 1-2, pp. 244-251, 2007.\par \par Y. S.  Bhole, Karadkar, P. B., and Kharul, U. K., ?Nitration and amination of polyphenylene oxide: synthesis, gas sorption and permeation analysis?, European Polymer Journal, vol. 43, no. 4, pp. 1450-1459, 2007.\par \par }