Aubert, M., & Lima, E. (1986). Hydrothermal activity detected by self-potential measurements at the N-S volcanic axis between the volcanoes "Nevado de Colima" and "Volcán de fuego de Colima" (México). Geofísica Internacional, 25(4), 575–586. https://doi.org/10.22201/igeof.00167169p.1986.25.4.779