Toshiaki Fukada Mike Schuster Yoshinori Sagisaka Phoneme boundary estimation using bidirectional recurrent neural networks and its applications. 20-30 1999 30 Systems and Computers in Japan 4 http://dx.doi.org/10.1002/(SICI)1520-684X(199904)30:4<20::AID-SCJ3>3.0.CO;2-E db/journals/scjapan/scjapan30.html#FukadaSS99