Hasan, ATM Kamrul. “Multiplicity of Active-Site in Heterogeneous Ziegler-Natta Catalyst and Its Correlation With Polymer Microstructure”. Bangladesh Journal of Scientific and Industrial Research 46, no. 4 (January 27, 2012): 487–494. Accessed October 17, 2025. https://www.banglajol.info/index.php/BJSIR/article/view/9596.