Aiuppa., A., Rotolo, S. G. and Villa, I. M. (2013) “STRATIGRAPHY, GEOCHEMISTRY AND GEOCHRONOLOGY OF A QUATERNARY PYROCLASTIC SEQUENCE OF THE CHICHONTEPEC VOLCANO, EL SALVADOR”, Revista geológica de América central, 22. doi: 10.15517/rgac.v0i22.8588.