Context Dependent Modeling of Phones in Continuous Speech Using Decision Trees L R Bahl author P V de Souza author P S Gopalakrishnan author D Nahamoo author M A Picheny author 1991 text Speech and Natural Language: Proceedings of a Workshop Held at Pacific Grove, California, February 19-22, 1991 conference publication bahl-etal-1991-context https://aclanthology.org/H91-1051/ 1991