Pacheco A., J., Cabrera S., A. y Marín, L.E. 2000. Bacteriological contamination in the karstic aquifer of Yucatán, Mexico . Geofísica Internacional. 39, 3 (jul. 2000), 285–291. DOI:https://doi.org/10.22201/igeof.00167169p.2000.39.3.332.