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Antonio M. Peinado Ramon Román José C. Segura Antonio J. Rubio Pedro García Jesús E. Díaz-Verdejo Entropic training for HMM speech recognition. 1991 EUROSPEECH http://www.isca-speech.org/archive/eurospeech_1991/e91_0651.html conf/interspeech/1991 db/conf/interspeech/eurospeech1991.html#PeinadoRSRGD91