Ushakova, T. M., et al. “Modification of Polyethylene by Sequential Homo- and Copolymerization of Ethylene and Alpha-Olefins over Homogeneous Zirconocene Catalysts”. Polimery, vol. 46, no. 4, Sept. 2022, pp. 252-6, https://polimery.ichp.vot.pl/index.php/p/article/view/2070.