Alfonso Bosch Francisco Guil Carmen Martínez Roque Marín Series-Parallel and Tree-Decomposition Approaches for Fuzzy Constraint Networks. 275-284 2002 conf/iberamia/2002 IBERAMIA http://link.springer.de/link/service/series/0558/bibs/2527/25270275.htm db/conf/iberamia/iberamia2002.html#BoschGMM02