@inproceedings{gil_tapias_gancedo_charfuelan_hernández_1999, 
  title={Robust and flexible mixed-initiative dialogue for telephone services}, 
  DOI={10.3115/977035.977089}, 
  publisher={Association for Computational Linguistics}, 
  author={Gil and Tapias and Gancedo and Charfuelan and Hernández}, 
  year={1999}
  }