Medina, F., M. Hidalgo, R. Sanchéz, T. Rajmankina, and A. Parada. “Effects of SUpport Preparation on the Perfonnance of the Catalysts Ziegler-Natta Based in TiCI4/MgCI2”. Rev. Téc. Fac. Ing. Univ. Zulia, Vol. 19, no. 2, 1, https://produccioncientificaluz.org/index.php/tecnica/article/view/5504.