Pérez-de-Tejada, H. «Ionospheric Measurements Conducted During the July 11,1991 Solar Total Eclipse at the Ionospheric Station “El Cerrillo”, Mexico». Geofísica Internacional 32, no. 1 (enero 1, 1993): 15–20. Accedido mayo 18, 2024. http://revistagi.geofisica.unam.mx/index.php/RGI/article/view/1344.