BBN ATIS System Progress Report - June 1990 M Bates author R Bobrow author S Boisen author R Ingria author D Stallard author 1990 text Speech and Natural Language: Proceedings of a Workshop Held at Hidden Valley, Pennsylvania, June 24-27,1990 conference publication bates-etal-1990-bbn https://aclanthology.org/H90-1026/ 1990