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Mario Blanco Cazas, "Informe Laboratorio de Rayos X — FRX-DRX" (页面存档备份,存于互联网档案馆) (in Spanish), Universidad Mayor de San Andres, Facultad de Ciencias Geologicas, Instituto de Investigaciones Geologicas y del Medio Ambiente, La Paz, Bolivia, September 20, 2007. Retrieved October 10, 2007.
Mario Blanco Cazas, "Informe Laboratorio de Rayos X — FRX-DRX" (页面存档备份,存于互联网档案馆) (in Spanish), Universidad Mayor de San Andres, Facultad de Ciencias Geologicas, Instituto de Investigaciones Geologicas y del Medio Ambiente, La Paz, Bolivia, September 20, 2007. Retrieved October 10, 2007.