@inproceedings{ijcai2003p64,
  title     = {Hierarchical Hidden Markov Models for Information Extraction},
  author    = {Skounakis, Marios and Craven, Mark and Ray, Soumya},
  booktitle = {Proceedings of the Eighteenth International Joint Conference on
               Artificial Intelligence, {IJCAI-03}},
  publisher = {International Joint Conferences on Artificial Intelligence},
  editor    = {Georg Gottlob},
  pages     = {427--432},
  year      = {2003},
  url       = {https://ijcai.org/proceedings/2003/64},
}