García-Ramírez, C. A., & Ríos-Reyes, C. (2004). Ocurrence and significance of the polymorphs of Al2SiO5 in Metamorphic rocks of the Santander Massif, Eastern Cordillera (Colombian Andes). Boletín De Geología, 26(43), 23–38. Retrieved from https://revistas.uis.edu.co/index.php/revistaboletindegeologia/article/view/9094