Akhter, T., N. Z. Raza, K. Mahmood, and M. Iqbal. “The Effect of Unsaturated Polyester Resin from Recycled PET As Compatibilizer for Styrene-Butadiene (SBR)/Acrylonitrile-Butadiene (NBR) Rubber Blend: Effect of UPR on Rubber Blends”. Biological Sciences - PJSIR, vol. 52, no. 6, Dec. 2009, pp. 341-6, http://v2.pjsir.org/index.php/biological-sciences/article/view/582.