Manfred Ehlers Multi-image Fusion in Remote Sensing: Spatial Enhancement vs. Spectral Characteristics Preservation. 75-84 2008 ISVC (2) http://dx.doi.org/10.1007/978-3-540-89646-3_8 conf/isvc/2008-2 db/conf/isvc/isvc2008-2.html#Ehlers08