Stefano Bistarelli Rosella Gennari Francesca Rossi Constraint Propagation for Soft Constraints: Generalization and Termination Conditions. 83-97 http://link.springer.de/link/service/series/0558/bibs/1894/18940083.htm 2000 conf/cp/2000 CP db/conf/cp/cp2000.html#BistarelliGR00