Jon Sneyers, Tom Schrijvers, Bart Demoen. Guard Simplification in CHR programs. In Armin Wolf, Thom W. Frühwirth, Marc Meister, editors, 19th Workshop on (Constraint) Logic Programming, Ulm, Germany, February 21-23, 2005. Volume 2005-01 of Ulmer Informatik-Berichte, pages 123-134, Universität Ulm, Germany, 2005.