DARPA February 1992 ATIS Benchmark Test Results David S Pallett author Nancy L Dahlgren author Jonathan G Fiscus author William M Fisher author John S Garofolo author Brett C Tjaden author 1992 text Speech and Natural Language: Proceedings of a Workshop Held at Harriman, New York, February 23-26, 1992 conference publication pallett-etal-1992-darpa https://aclanthology.org/H92-1004/ 1992