Georg Gottlob Gianluigi Greco Bruno Marnette HyperConsistency Width for Constraint Satisfaction: Algorithms and Complexity Results. 87-99 2009 Graph Theory, Computational Intelligence and Thought http://dx.doi.org/10.1007/978-3-642-02029-2_9 conf/birthday/2009golumbic db/conf/birthday/golumbic2009.html#GottlobGM09