S. Rosero, J. C. Silva, A. N. Sial, C. Borrero, and A. Pardo, “STRONTIUM ISOTOPES CHEMOSTRATIGRAPHY FROM SOME EOCENE-OLIGOCENE SUCCESSIONS IN THE SAN JACINTO BELT AND THE LOWER MAGDALENA VALLEY”, Bol. Geol., vol. 36, no. 1, May 2014.