@article{Lammich09a,
  title = {Tree Automata},
  author = {Peter Lammich},
  year = {2009},
  url = {http://afp.sourceforge.net/entries/Tree-Automata.shtml},
  note = {Formal proof development},
  researchr = {https://researchr.org/publication/Lammich09a},
  cites = {0},
  citedby = {0},
  journal = {Archive of Formal Proofs},
  volume = {2009},
}