Mazin G. Rahim Giuseppe Di Fabbrizio Candace A. Kamm Marilyn A. Walker A. Pokrovsky P. Ruscitti Esther Levin Sungbok Lee Ann K. Syrdal K. Schlosser Voice-IF: a mixed-initiative spoken dialogue system for AT&t conference services. 1339-1342 2001 INTERSPEECH http://www.isca-speech.org/archive/eurospeech_2001/e01_1339.html conf/interspeech/2001 db/conf/interspeech/interspeech2001.html#RahimFKWPRLLSS01