Escobar, Marcos, y Jesús Rubio. «Physicochemical, Petrographic and Rheologic Evaluation of Seams 2 and 3 Coals from Mina Norte, Guajira Municipality, Zulia State, Venezuela.». Rev. Téc. Fac. Ing. Univ. Zulia 34, no. 3 (1). Accedido agosto 2, 2025. https://produccioncientifica.luz.edu.ve/index.php/tecnica/article/view/7188.