@booklet {, title = {Hole-filled SRTM for the globe Version 3, CGIAR-CSI SRTM 90m Database}, year = {2006}, publisher = {Consultative Group for International Agricultural Research }, url = {http://srtm.csi.cgiar.org}, author = {Jarvis, A. and Reuter, H. I. and Nelson, A. and Guevara, E.} }