1. Clark, R.N., Swayze, G.A., Gallagher, A.J., King, T.V.V., Calvin, W.M., 1993. The U.S. Geological Survey Digital Spectral Library: Version 1: 0.2 to 3.0 μm. USGS Open File Report 93-592, USGS, Denver. 1340 pp.
2. Introduction to Database Systems;Date,1995
3. DLR, 2002. http://ims.dfd.dlr.de (accessed 24 April 2002).
4. European Commission DG XI (Environment, Nuclear Safety and Civil Protection) (ed.), 1993. CORINE land cover—Technical guide. EUR 12585 EN, Office for Official Publication's of the European Communities, Luxembourg. 136 pp.
5. CGI Programming on the World Wide Web;Gundavaram,1996