RAMÓN, J. C., L. DZOU, and B. GIRALDO. “Geochemical Evaluation of the Middle Magdalena Basin, Colombia”. CT&F - Ciencia, Tecnología y Futuro 1, no. 3 (December 31, 1997): 47–66. Accessed May 6, 2024. https://ctyf.journal.ecopetrol.com.co/index.php/ctyf/article/view/587.