Cobaleda, G., R. Ehrlich, and J. Barclay Ferm. “Relationship Between Petrographic Pore Types and Core Measurements in Sandstones of the Monserrate Formation, Upper Magdalena Valley, Colombia”. CT&F - Ciencia, Tecnología y Futuro 1, no. 3 (December 31, 1997): 5–17. Accessed June 1, 2025. https://ctyf.journal.ecopetrol.com.co/index.php/ctyf/article/view/585.