From Speech Recognition to Spoken Language Understanding: The Development of the MIT SUMMIT and VOYAGER Systems

Zue, Victor, Glass, James, Goodine, David, Hirschman, Lynette, Leung, Hong, Phillips, Michael, Polifroni, Joseph, Seneff, Stephanie

Dec-31-1991–Neural Information Processing Systems 

Spokeninput to computers, however, has yet to pass the threshold of practicality.