@InProceedings{tenCate-Lutz-07,
  author = 	 {Balder ten Cate and Carsten Lutz},
  title = 	 {Query Containment in Very Expressive {XPath} dialects},
  booktitle = 	 {26th {ACM} Symposium on Principles of Database Systems (PODS'07)},
  year = 	 {2007},
  publisher =	 "ACM Press",
  editor =       "Leonid Libkin",
  pages =        "73--82",
}