@inproceedings{conf/pods/GottlobMS07,
  author = "Georg Gottlob and Zolt{\'a}n Mikl{\'o}s and Thomas Schwentick",
  booktitle = "{Proceedings of the Twenty-Sixth ACM SIGACT-SIGMOD-SIGART Symposium on Principles of Database Systems, June 11-13, 2007, Beijing, China}",
  doi = "10.1145/1265530.1265533",
  editor = "Leonid Libkin",
  isbn = "978-1-59593-685-1",
  pages = "13-22",
  publisher = "ACM",
  title = "Generalized hypertree decompositions: np-hardness and tractable variants",
  year = "2007",
}