The BBN Spoken Language System Sean Boisen author Yen-Lu Chow author Andrew Haas author Robert Ingria author Salim Roukos author David Stallard author 1989 text Speech and Natural Language: Proceedings of a Workshop Held at Philadelphia, Pennsylvania, February 21-23, 1989 conference publication boisen-etal-1989-bbn https://aclanthology.org/H89-1012/ 1989