@InProceedings{pietra-EtAl:1997:ACL,
  author    = {Stephen Della Pietra  and  Mark Epstein  and  Salim Roukos  and  Todd Ward},
  title     = {Fertility Models for Statistical Natural Language Understanding},
  booktitle = {Proceedings of the 35th Annual Meeting of the Association for Computational Linguistics},
  month     = {July},
  year      = {1997},
  address   = {Madrid, Spain},
  publisher = {Association for Computational Linguistics},
  pages     = {168--173},
  url       = {http://www.aclweb.org/anthology/P97-1022},
  doi       = {10.3115/976909.979639}
}