@InProceedings{hayes:1980:ACL,
  author    = {Phil Hayes},
  title     = {Expanding the Horizons of Natural Language Interfaces},
  booktitle = {Proceedings of the 18th Annual Meeting of the Association for Computational Linguistics},
  month     = {June},
  year      = {1980},
  address   = {Philadelphia, Pennsylvania, USA},
  publisher = {Association for Computational Linguistics},
  pages     = {71--74},
  url       = {http://www.aclweb.org/anthology/P80-1019},
  doi       = {10.3115/981436.981459}
}