Ronald A. Cole Lynette Hirschman Les A. Atlas Mary E. Beckman Alan Biermann Marcia Bush Mark Clements Jordan Cohen Oscar Garcia Brian A. Hanson Hynek Hermansky Steve Levinson Kathy McKeown Nelson Morgan David G. Novick Mari Ostendorf Sharon Oviatt Patti Price Harvey Silverman Judy Spitz Alex Waibel Clifford J. Weinstein Steve Zahorian Victor Zue The challenge of spoken language systems: research directions for the nineties. 1-21 1995 3 IEEE Transactions on Speech and Audio Processing 1 http://dx.doi.org/10.1109/89.365385 db/journals/taslp/taslp3.html#ColeHABBBCCGHHLMMNOOPSSWWZZ95