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2. An experimental pitch indicator for training deaf scholars;Anderson;Journal of the Acoustical Society of America,1960
3. Learning visual correlates of fricative production by normal-hearing subjects: A preliminary evaluation of the video articulator;Bargstadt;Journal of Speech and Hearing Disorders,1978
4. Acceptance of the video articulator;Berg,1975
5. Boothroyd, A. Development of small speech training aids—third progress report. Clarke School for the Deaf Report, S.A.R.P. No. 27, 1977.