Mirko Appel Nassir Navab 3D Reconstruction from Co-Registered Orthographic and Perspective Images: Theoretical Framework and Applications. 21-26 2002 ICPR (4) http://doi.ieeecomputersociety.org/10.1109/ICPR.2002.1047391 db/conf/icpr/icpr2002-4.html#AppelN02