Havskov, J., S. K. Singh, and J. M. Espinosa. “Afthershocks Int the First 32 Hours Following Oaxaca Earthquake of 29 November, 1978 Determined from Sismex Network”. Geofisica Internacional 17, no. 3 (July 1, 1978): 327–334. Accessed May 18, 2024. http://revistagi.geofisica.unam.mx/index.php/RGI/article/view/1459.