1. B. T. Lowerre. “The HARPY speech recognition system.” Ph.D. dissertation. Comput. Sci. Dep., Carnegie Mellon Univ., Apr. 1976.
2. “Speaker-independent isolated word recognition using a 129-word airline vocabulary.”;Wilpon;J. Acousi. Soc. Amer.,1982
3. R. A. Cole. R. M. Slem. M. S Phillips. S M Brill. P. Specker. and A. P. Pilant.” Feature-based speaker independent recognition of English letters.” presented at the IEEE Int. Conf. Acoust., Speech. Signal Processing. Oct. 1983.
4. F. Jelinek et al., “A real-time. isolated-word. speech recognition system for dictation transcription.” in Proc. IEEE Int. Conf. Acoust., Speech. Signal Proiessing. Mar. 1985.
5. “Robust HMM-based techniques for recognition of speech produced under stress and in noise.”;Paul;Speech Tech.,1986