@inproceedings{conf/pods/GottlobLS01,
  title = "Robbers, Marshals, and Guards: Game Theoretic and Logical Characterizations of Hypertree Width",
  author = "Georg Gottlob and Nicola Leone and Francesco Scarcello",
  year = "2001",
  booktitle = "{Proceedings of the Twentieth ACM SIGACT-SIGMOD-SIGART Symposium on Principles of Database Systems, May 21-23, 2001, Santa Barbara, California, USA}",
  isbn = "1-58113-361-8",
  publisher = "ACM",
  url = "http://www.acm.org/sigs/sigmod/pods/proc01/online/p68.pdf",
  doi = "10.1145/375551.375579",
}