Casal, M. D., M. A. Díez, R. Álvarez, C. Barriocanal, C. S. Canga, and J. J. Pis. “Influence of Natural Weathering of Two Medium-Volatile Bituminous Coals of Similar Rank on Coke Quality”. Revista de Metalurgia 34, no. 1 (February 28, 1998): 3–10. Accessed April 20, 2024. https://revistademetalurgia.revistas.csic.es/index.php/revistademetalurgia/article/view/653.