Y. P. . Solano, R. Uribe, M. Frydman, N. F. Saavedra, and Z. H. . Calderón, “A modified approach to predict pore pressure using the d exponent method: an example from the Carbonera formation, Colombia”, CT&F Cienc. Tecnol. Futuro, vol. 3, no. 3, pp. 103–111, Dec. 2007.