Amihood Amir Ayelet Butman Maxime Crochemore Gad M. Landau Malka Schaps Two-Dimensional Pattern Matching with Rotations. 17-31 2003 conf/cpm/2003 CPM http://link.springer.de/link/service/series/0558/bibs/2676/26760017.htm db/conf/cpm/cpm2003.html#AmirBCLS03