@inproceedings{conf/icalp/GottlobLS99,
  title = "Computing LOGCFL Certificates",
  author = "Georg Gottlob and Nicola Leone and Francesco Scarcello",
  year = "1999",
  booktitle = "{Automata, Languages and Programming, 26th International Colloquium, ICALP'99, Prague, Czech Republic, July 11-15, 1999, Proceedings}",
  editor = "Jir\'{\i} Wiedermann and Peter van Emde Boas and Mogens Nielsen",
  isbn = "3-540-66224-3",
  pages = "361-371",
  publisher = "Springer",
  series = "Lecture Notes in Computer Science",
  url = "http://link.springer.de/link/service/series/0558/bibs/1644/16440361.htm",
  volume = "1644",
}