[1]
G. . COBALEDA, R. EHRLICH, and J. B. . FERM, “Relationship between petrographic pore types and core measurements in sandstones of the Monserrate formation, upper Magdalena valley, Colombia”, CT&F Cienc. Tecnol. Futuro, vol. 1, no. 3, pp. 5–17, Dec. 1997.