Pérez-de-Tejada, H. 1993. Ionospheric measurements conducted during the July 11,1991 solar total eclipse at the ionospheric station "El Cerrillo", Mexico. Geofísica Internacional. 32, 1 (ene. 1993), 15–20. DOI:https://doi.org/10.22201/igeof.00167169p.1993.32.1.1148.