MACGEE, J. J.; TILLING, R. I.; DUFFIELD, W. A. PETROLOGIC CHARACTERISTICS OF THE 1982 AND PRE-1982 ERUPTIVE PRODUCTS OF EL CHICHON VOLCANO, CHIAPAS, MEXICO. GeofĂ­sica Internacional, [S. l.], v. 26, n. 1, p. 85-108, 1987. DOI: 10.22201/igeof.00167169p.1987.26.1.1190. DisponĂ­vel em: http://revistagi.geofisica.unam.mx/index.php/RGI/article/view/1190. Acesso em: 18 jan. 2022.