1. Vicsi, K.: Computer-Assisted Pronunciation Teaching and Training Methods Based on the Dynamic Spectro-Temporal Characteristics of Speech. In: Dynamics of Speech Production and Perception, pp. 283–304. IOS Press, Amsterdam (2006)
2. de Bot, K.: Visual feedback of intonation: Effectiveness and induced practice behavior. Lang. Speech 26(4), 331–335 (1983)
3. James, E.: The acquisition of prosodic features of speech using a speech visualizer. IRAL 14(3), 227–243 (1976)
4. Vicsi, K., Csatári, F., Bakcsi, Z., Tantos, A.: Distance score evaluation of the visualized speech spectra at audio-visual articulation training. In: Proc. Eurospeech, pp. 1911–1914 (1999)
5. ISTRA Indiana Speech Training Aid Features. Bloomington, IN: Communication Disorders Technology, Inc. (2003), http://www.comdistec.com/istra_faq.shtml