Y. S.  Bhole, Kharul, U. K., Somani, S. P., and Kumbharkar, S. C., ?Benzoylation of polyphenylene oxide: characterization and gas permeability investigations?, European Polymer Journal, vol. 41, no. 10, pp. 2461-2471, 2005.

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.

B.  Shrimant, Dangat, Y., Kharul, U. K., and Wadgaonkar, P. P., ?Intrinsically microporous polyimides containing spirobisindane and phenazine units: synthesis, characterization and gas permeation properties?, Journal of Polymer Science Part A - Polymer Chemistry, vol. 56, pp. 766-775, 2018.