Restrepo, J. I., and H. A. Cowan. “The ‘Eje Cafetero’ Earthquake, Colombia of January 25, 1999 ”. Bulletin of the New Zealand Society for Earthquake Engineering 33, no. 1 (March 31, 2000): 1–29. Accessed July 26, 2026. https://bulletin.nzsee.org.nz/article/view/502.