Korach, Ł., et al. “Silica Powder Obtained by Sol-Gel Method As a Support of Organometallic Vanadium Catalyst for Ethylene Polymerization”. Polimery, vol. 49, no. 9, Sept. 2022, pp. 641-5, https://polimery.ichp.vot.pl/index.php/p/article/view/1795.