@proceedings{ escadafal1994, author = {Escadafal, R. and Belghith, A. and Ben Moussa, H.}, title = {Indices spectraux pour la dégradation des milieux naturels en Tunisie aride}, journal = {6ème Symp. Int. Mesures Physiques et Signatures en Télédétection, ISPRS-CNES}, publisher = {}, address = {Val d’lsère, France}, pages = {253–259}, volume = {}, number = {}, year = {1994} } @misc{ idb, author = {Henrich, V. and Krauss, G. and Götze, C. and Sandow, C.}, title = {The IndexDatabase}, publisher = {}, address = {Bonn}, pages = {}, volume = {}, number = {}, year = {2011} }