Madondo, Joseph, et al. “Geology and Geochemistry of Jasperoids from the ‘Montaña De Manganeso’ District, San Luis Potosí, North-Central Mexico”. Revista Mexicana De Ciencias Geológicas, vol. 38, no. 3, Nov. 2021, pp. 193-09, doi:10.22201/cgeo.20072902e.2021.3.1651.