Poetsch, Thomas. “Forms and Dynamics of Silica Gel in a Tuff-Dominated Soil Complex: Results of Micromorphological Studies in the Central Highlands of Mexico”. Revista Mexicana de Ciencias Geológicas 21, no. 1 (May 18, 2018): 195–201. Accessed May 1, 2025. https://www.rmcg.unam.mx/index.php/rmcg/article/view/915.