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2. Speech correction: principles and methods;Van Riper,1963
3. Measurement of the phonation time;Sawashima;Jpn J Logoped Phoniatr,1966
4. Funktionelle Stimmstörungen und ihre Behandlung;Habermann;Arch Ohr Nas Kehlk Heilk,1980
5. Voice and articulation drillbook;Fairbanks,1960