Escobar, M., & Rubio, J. (1). 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(3). Recuperado a partir de https://mail.produccioncientificaluz.org/index.php/tecnica/article/view/7188