@inproceedings{conf/lics/GottlobK02,
  title = "Monadic Queries over Tree-Structured Data",
  author = "Georg Gottlob and Christoph Koch",
  year = "2002",
  booktitle = "{17th IEEE Symposium on Logic in Computer Science (LICS 2002), 22-25 July 2002, Copenhagen, Denmark, Proceedings}",
  isbn = "0-7695-1483-9",
  pages = "189-202",
  publisher = "IEEE Computer Society",
  doi = "10.1109/LICS.2002.1029828",
}