1. Costa AC. 2007. Hydrology of an experimental basin in a Caatinga preservation area in Brazilian semiarid region (in Portuguese). MSc thesis, Civil Engineering, Federal University of Ceará, Fortaleza, Brazil.
2. Creutzfeldt B. 2006. Remote sensing based characterization of land cover and terrain properties for hydrological modeling in the semiarid Northeast of Brazil. MSc thesis, Institute of Geoecology, University of Potsdam, Germany.