@Misc{tata97,
  author = {H. Comon and M. Dauchet and R. Gilleron and F. Jacquemard
and D. Lugiez and S. Tison and M. Tommasi},
  title =	 {Tree Automata Techniques and Applications},
  howpublished = {Available on: \url{http://www.grappa.univ-lille3.fr/tata}},
  note = {release October, 1rst 2002},
  year =	 1997
}