C. A. Löbler, A. A. V. Ssccoti, L. G. Terra, T. Ertel, and J. L. S. da Silva, “COMPARATIVE STUDY BETWEEN SRTM IMAGES AND ARMY LETTERS TO THE STUDY OF ALTIMETRIC PLAN IN WATERSHED”, REGET, vol. 15, no. 15, pp. 3005–3011, Oct. 2013.