Ronca, G., L. Márquez, and C. Albano. “Study of the Heterogenous Crystallization of Polypropylene With Various Coupling Agents”. Rev. Téc. Fac. Ing. Univ. Zulia, Vol. 22, no. 2, 1, https://mail.produccioncientificaluz.org/index.php/tecnica/article/view/5624.