A. Audemard M. Franck, Morpho-Structural Expression of Active Thrust Fault Systems in the Humid Tropical Foothills of Colombia and Venezuela, Zeitschrift fur Geomorphologie. Supplementband Zeitschrift fur Geomorphologie. Supplement;Zeitschrift fur Geomorphologie. Supplementary issue Annals of geomorphology. Supplement;Annales de geomorphologie. Supplement, 118, 1999, pp. 227-244