G. Toro et al., Fission-track datings and geomorphic evidences for long-term stabiity in the Central Cordillera highlands, Colombia, Zeitschrift fur Geomorphologie. Supplementband Zeitschrift fur Geomorphologie. Supplement;Zeitschrift fur Geomorphologie. Supplementary issue Annals of geomorphology. Supplement;Annales de geomorphologie. Supplement, 145, 2006, pp. 1-16