Kudriavtsev, Y., S. Gallardo, A. Villegas, G. Ramirez, M. Luna, M. Aguilar, and R. Asomoza. “Analytical Study of the Obsidian Hydration Process”. Revista Mexicana De Física, vol. 56, no. 3, Jan. 2010, pp. 204-0, https://rmf.smf.mx/ojs/index.php/rmf/article/view/3749.