Sathiamoorthy Subbarayan Henrik Reif Andersen Backtracking Procedures for Hypertree, HyperSpread and Connected Hypertree Decomposition of CSPs. 180-185 2007 conf/ijcai/2007 IJCAI http://dli.iiit.ac.in/ijcai/IJCAI-2007/PDF/IJCAI07-027.pdf db/conf/ijcai/ijcai2007.html#SubbarayanA07