Substate tying with combined parameter training and reduction in tied-mixture HMM design.

Liang Gu Kenneth Rose Substate tying with combined parameter training and reduction in tied-mixture HMM design. 137-145 2002 10 IEEE Transactions on Speech and Audio Processing 3 http://dx.doi.org/10.1109/TSA.2002.1001978 db/journals/taslp/taslp10.html#GuR02