Paul C. Bagshaw Steven M. Hiller Mervyn A. Jack Enhanced pitch tracking and the processing of <i>F</i><sub>0</sub> contours for computer aided intonation teaching. 1993 EUROSPEECH http://www.isca-speech.org/archive/eurospeech_1993/e93_1003.html conf/interspeech/1993 db/conf/interspeech/eurospeech1993.html#BagshawHJ93