VILLAMIL T. Depositional and geochemical cyclicity in the cretaceous fine-grained strata of Colombia. a model for organic matter content. CT&F Cienc. Tecnol. Futuro [Internet]. 1996 Dec. 31 [cited 2024 May 4];1(2):5-23. Available from: https://ctyf.journal.ecopetrol.com.co/index.php/ctyf/article/view/594