El-Fathi El-Mejbri Hans Grabowski Harald Kunze Ralf-Stefan Lossack Arno Michelis 3D Reconstruction of Paper Based Assembly Drawings: State of the Art and Approach. 1-12 2001 conf/grec/2001 GREC http://link.springer.de/link/service/series/0558/bibs/2390/23900001.htm db/conf/grec/grec2001.html#El-MejbriGKLM01