Segovia, N., Armienta, M.A., Seidel, J.L., Monnin, M., Peña, P., López, M.B.E., Mena, M., Valdés, C., Tamez, E., López, R.N. y Aranda, P. 2002. Radon in soil and chemical composition of spring water near Popocatépetl volcano, Mexico. Geofísica Internacional. 41, 4 (oct. 2002), 399–405. DOI:https://doi.org/10.22201/igeof.00167169p.2002.41.4.486.