Luigi Cinque Sergio De Agostino Franco Liberati Bart J. Westgeest A Simple Lossless Compression Heuristic for Grey Scale Images. 48-55 2004 conf/stringology/2004 Stringology http://psc.felk.cvut.cz/event/2004/p4.html db/conf/stringology/stringology2004.html#CinqueALW04