Faysal Boughorbel Andreas Koschan Besma R. Abidi Mongi A. Abidi Gaussian Energy Functions for Registration without Correspondences. 24-27 2004 ICPR (3) http://doi.ieeecomputersociety.org/10.1109/ICPR.2004.408 db/conf/icpr/icpr2004-3.html#BoughorbelKAA04