Steinich, Birgit, Gerardo Bocanegra, and Eva Sánchez. 1999. “Basement Topography and Fresh-Water Resources of the Coastal Aquifer at Acapetahua, Chiapas, Mexico”. Geofisica Internacional 38 (2):107-15. https://doi.org/10.22201/igeof.00167169p.1999.38.2.388.