1. Tree clustering for constraint networks;Dechter;Artif. Intell.,1989
2. Complexity of k-tree structured constraint satisfaction problems;Freuder,1990
3. Quantified constraint satisfaction and bounded treewidth;Chen,2004
4. The complexity of quantified constraint satisfaction problems under structural restrictions;Gottlob,2005
5. Fixed-parameter hierarchies inside PSPACE;Pan,2006