@inproceedings(2001-efficient-analysis-of-tree-languages-for-robust-pattern-recognition,
  author = {Salvador España Boquera and Damián López},
  title = {Efficient analysis of tree languages for robust pattern recognition},
  year = {2001},
  booktitle = {Taller Iberoamericano de Reconocimiento de Patrones (TIARP)},
  address = {México DF, México},
  pages = {167-178}
)