Ríos, C. A., Williams, C. D., & Castellanos, O. M. (2012). Crystallization of low silica Na-A and Na-X zeolites from transformation of kaolin and obsidian by alkaline fusion. Ingeniería Y Competitividad, 14(2), 125–137. https://doi.org/10.25100/iyc.v14i2.2661