有相當比率的人工電子耳兒童，與聽常同儕相較下，有明顯的嗓音問題，他們的音高起伏較大，音量亦普遍較大，並有控制不佳而起伏不定的情形。由於聲帶功能運動具有增加喉部肌肉的協調性與控制性，和改善整體音質的功能，因此本研究透過聲帶功能運動並搭配波型圖的APP軟體提供視覺回饋，以期能改善人工電子耳兒童的嗓音品質，使其溝通更具效率。
本研究為10位配戴人工電子耳的國小學童進行六週的聲帶功能運動訓練，受試兒童每天需居家練習兩次，每次十五至二十分鐘，另外，研究人員每週會至個案家中進行一次介入，了解受試兒童的練習情形，並提供訓練與修正。
本研究採用Computerized Speech Laboratory與Multi-Dimens ional Voice Program進行聲學分析，以GRBAS量表進行聽知覺評估，並藉由嗓音障礙指數簡易版(VHI-10)評估受試兒童對於其嗓音障礙的自覺情形。根據前後測的評估結果發現，受試兒童在以下的分析指標皆有所改變：
(一)、聲學分析指標，包括頻率擾動係數、振幅擾動係數、頻率波峰變異、振幅波峰變異以及噪訊比等皆出現顯著性改善(p<0.05)。
(二)、氣動學分析的最長發聲時長亦呈現顯著延伸(p<0.05)。
(三)、嗓音障礙自覺評量：在介入後，個案自覺嗓音障礙對日常生活的影響有顯著減小(p<0.05)。
(四)、聽知覺分析：在拉緊聲方面，個案達極顯著改善(p<0.01)，在整體嗓音品質、粗啞聲等方面皆出現顯著改善(p<0.05)，但在氣息聲與嗓音無力等方面未達顯著差異。
研究結果發現，聲帶功能運動可有效改善國小學齡人工電子耳兒童的嗓音異常，因此建議將聲帶功能運動列入人工電子耳學童的聽能復健方案中，以改善其嗓音品質，並提高溝通效能。

第一章 緒論 1
第一節 研究背景與動機 1
第二節 研究目的與待答問題 4
第三節 名詞釋義 6
第二章 文獻探討 13
第一節 人工電子耳兒童的音質與聽常兒童的差異 13
第二節 用於人工電子耳兒童嗓音問題的治療法 43
第三節 聲帶功能運動使用於其他族群之療效 57
第三章 研究方法 73
第一節 研究架構與設計 73
第二節 研究對象 79
第三節 研究工具 83
第四節 研究程序 90
第五節 資料處理與分析 95
第四章 研究結果與討論 98
第一節 受試者接受聲帶功能運動後其前後測變化 98
第二節 受試者於介入時的聲學與氣動學指標的變化 116
第三節 綜合討論 128
第五章 研究結論與建議 132
第一節 研究結論 132
第二節 研究限制與建議 134
參考文獻 138
中文部分 138
英文部分 139
附錄 153
附錄一 人工電子耳使用兒童基本資料調查表 153
附錄二 聽知覺評估量表 154
附錄三 嗓音障礙自我評估量表 155
附錄四 受試者同意書 156
附錄五 受試者在家練習紀錄表 158
附錄六 國語短文 159
附錄七 聲帶功能運動於介入期間的施行細節 160

中文部分
王南梅、郭于靚、黃國祐、劉樹玉、劉俊榮(2009)。台灣電子耳兒童現況調查研究──電子耳使用、聽覺能力、口語溝通能力表現。台灣聽力語言學會雜誌，22，55-85。
王南梅、黃國祐、蘇茂昌、辛宗翰(2011)。華文版「嗓音障礙指數量表」(VHI-10)發展與驗證。台灣耳鼻喉頭頸外科雜誌，46(4)，190-196。
李淑娥、徐道昌（1986）。非口語溝通系統對失語症療效之初步評估：病例報告。中華民國復健醫學會雜誌，12，77-81。
杜正治譯(1994)單一受試研究法。台北：心理出版社。
沈明來(2007)。試驗設計學。台北：九州圖書文物有限公司。
許宏瑋(2012)。以多面向嗓音評估比較使用電子耳與聽力正常學童的喉部功能和嗓音相關生活品質（未出版之碩士論文）。國立臺北護理健康大學，臺北市。
曾進興譯 (2002)。教導重度障礙學生溝通技能。台北：心理出版社。
程大器(2013) 。統計學(下)重點整理。台北：高點。
潘滔(2002)。第二部分：食管發音與發音管發音的嗓音客觀檢測。（未出版之博士論文）。中國醫學科學院中國協和醫科大學，北京。
鄭靜宜(2011) 。語音聲學—說話聲音的科學。心理出版社。
管美玲(2012)。聽損兒童聽覺技巧訓練課程（第二版）。心理出版社。
盧采臻(2010)。良好聽能表現之人工電子耳使用者華語聲調及嗓音特質之研究（未出版之碩士論文）。國立臺北教育大學特殊教育研究所碩士論文，台北市。
龐麗娟、李輝、林崇德、游恆山(1994)。嬰兒心理學。台北：五南出版社。

英文部分

Angelocci, A.A., Koppga, G.A., & Holbrook, A. (1964).The vowel formants of deaf and normal-hearing eleven-to fourteen-year-old boys. Journal og Dpeech and Hearing Research.35, 296-308.
Artières, F., Vieu, A., Mondain, M., Uziel, A., &Venail, F. (2009).Impact of early cochlear implantation on the linguistic development of the deaf child.Otol Neurotol.(6),736-42. doi: 10.1097/MAO.0b013e3181b2367b.
Baken R.J. & Orlikoff R.F. (2000). Clinical Measurement of Speech & Voice. Singular Publishing Group.
Baudonck, N., D'haeseleer, E., Dhooge, I., & Van Lierde, K. (2011).Objective vocal quality in children using cochlear implants: a multiparameter approach.J Voice.25(6),683-91. doi: 10.1016/j.jvoice.2010.05.005.
Benjamin, B.J. (1982).Phonological performance in gerontological speech.J Psycholinguist Res. 11(2):159-67.
Berg, E.E., Hapner, E., Klein, A., & Johns, M.M. 3rd.(2008).Voice therapy improves quality of life in age-related dysphonia: a case-control study.J Voice.22(1):70-4. Epub 2006 Oct 25.
Bhuta T., Patrick L., & Garnett J.D.(2004). Perceptual evaluation of voice quality and its correlation with acoustic measurements.J Voice.18(3):299-304.
Bollard, P.M., Chute, P.M., Popp, A., & Parisier, S.C.(1999).Specific language growth in young children using the CLARION cochlear implant.Ann Otol Rhinol Laryngol Suppl. 1999 177,119-23.
Boone, D.R. (1966). Modification of the voices of deaf children. Volta Review, 68, 686–692.
Boseley, M.E.,& Myers, K.V. (2003).Conservative treatment of an obstructing vocal fold granuloma.Ear Nose Throat J.82(8):550.
Breitenstein, C., van Lancker, D., & Daum, I. (2001). The contribution of speech rate and pitch variation to the perception of vocal emotions in a German and an American sample. Cognition & Emotion, Vol. 15, pp. 57-79.
Brouns, K., Refaie, A.E., & Pryce, H. (2011).Auditory Training and Adult Rehabilitation:A Critical Review of the Evidence. Global Journal of Health Science.3(1):49-63.
Bzoch, K.R. (1989). Measurements and assessments of categorical aspects of cleft palate language, voice and speech disorders. In KR Bzoch(ed.), Communication disorders related to cleft Lip and Palate. Boston: College-Hill press.
Campisi, P., Low, A., Papsin, B., Mount, R., Cohen-Kerem, R., & Harrison, R. (2005).Acoustic analysis of the voice in pediatric cochlear implant recipients: a longitudinal study.Laryngoscope. 115(6),1046-50.
Chen, S.H. (1996).Phonetograms of normal Taiwanese young adults. Ph.D. Dissertation, University of Wisconsin-Madison, Madison.
Coelho, A.C., Bevilacqua, M.C., Oliveira, G., & Behlau, M. (2009).Relationship between voice and speech perception in children with cochlear implant.Pro Fono. 21(1),7-12.
Colton, R., Casper, J., & Leonard, R. (2006). Understanding voice problems: A physiological perspective for diagnosis and treatment (3rd ed.). Baltimore, MD: Lippincott Williams & Wilkins.
Cowan RS, DelDot J, Barker EJ, Sarant JZ, Pegg P, Dettman S, Galvin KL, Rance G, Hollow R, Dowell RC, Pyman B, Gibson WP, Clark GM. (1997).Speech perception results for children with implants with different levels of preoperative residual hearing. Am J Otol. 18(6 Suppl):S125-6.
Dawson PW, Blamey PJ, Rowland LC, Dettman SJ, Clark GM, Busby PA, Brown AM, Dowell RC, Rickards FW.(1992).Cochlear implants in children, adolescents, and prelinguistically deafened adults: speech perception. J Speech Hear Res. 35(2),401-17.
De Bodt MS, Wuyts FL, Van de Heyning PH, Croux C.(1997).Test-retest study of the GRBAS scale: influence of experience and professional background on perceptual rating of voice quality.J Voice.11(1),74-80.
Dejonckere, P.H., & Wieneke, G.H. (1992). Cepstrum analysis of pathological voices: Correlations with other acoustic parameters and with perceptual scaling. In The new frontiers of oto-rhino-laryngology in Europe, 5, 75–78.
Devaney KO, Rinaldo A, Ferlito A. (2005). Vocal process granuloma of the larynx-recognition, differential diagnosis and treatment.Oral Oncol. 2005 Aug;41(7):666-9. Review.
D'haeseleer E, Depypere H, Claeys S, Van Lierde KM. (2011).Nasal resonance in middle-aged women: a multiparameter approach.Ann Otol Rhinol Laryngol.120(9):575-80.
Dowell, R.C., Hollow, R., & Winton, E.(2004).Outcomes for cochlear implant users with significant residual hearing: implications for selection criteria in children. Arch Otolaryngol Head Neck Surg.130(5),575-81.
Evans MK, Deliyski DD. (2007).Acoustic voice analysis of prelingually deaf adults before and after cochlear implantation.J Voice. 21(6),669-82.
Ferrand CT.(2002).Harmonics-to-noise ratio: an index of vocal aging. J Voice. 16(4):480-7.
Ferrand CT.(2006).Relationship between masking levels and phonatory stability in normal-speaking women. J Voice.20 (2):223-8.
Goldberg DM, Flexer C. (2001).Auditory-verbal graduates: outcome survey of clinical efficacy. J Am Acad Audiol.12(8),406-14.
Gorman S, Weinrich B, Lee L, Stemple JC. (2008).Aerodynamic changes as a result of vocal function exercises in elderly men.Laryngoscope.118(10):1900-3. doi: 10.1097/MLG.0b013e31817f9822.
Hess MM, Verdolini K, Bierhals W, Mansmann U, Gross M. (1998).Endolaryngeal contact pressures. J Voice.12(1):50-67.
Higgins MB, McCleary EA, Carney AE, Schulte L. (2003).Longitudinal changes in children's speech and voice physiology after cochlear implantation.Ear Hear.24(1),48-70.
Hillman RE, Holmberg EB, Perkell JS, Walsh M, Vaughan C. (1989). Objective assessment of vocal hyperfunction: an experimental framework and initial results.J Speech Hear Res. 32(2):373-92.
Hirano, M.(1981). Clinical examination of voice. New York: Springer-Verlag.
Hocevar-Boltezar I, Radsel Z, Vatovec J, Geczy B, Cernelc S, Gros A, Zupancic J, Battelino S, Lavrencak B, Zargi M. (2006).Change of phonation control after cochlear implantation.Otol Neurotol.27(4),499-503.
Hocevar-Boltezar I, Radsel Z, Vatovec J, Geczy B, Cernelc S, Gros A, Zupancic J, Battelino S, Lavrencak B, Zargi M. (2006).Change of phonation control after cochlear implantation.Otol Neurotol. 27(4),499-503.
Hocevar-Boltezar I, Vatovec J, Gros A, Zargi M. (2005). The influence of cochlear implantation on some voice parameters.Int J Pediatr Otorhinolaryngol. 69(12), 1635-40.
Holler T, Campisi P, Allegro J, Chadha NK, Harrison RV, Papsin B, Gordon K. (2010).Abnormal voicing in children using cochlear implants.Arch Otolaryngol Head Neck Surg. 136(1):17-21. doi: 10.1001/archoto.2009.194.
Holt CM, Dowell RC. (2011).Actor vocal training for the habilitation of speech in adolescent users of cochlear implants.J Deaf Stud Deaf Educ.16(1),140-51. doi: 10.1093/deafed/enq033.
Jacobson B.H, Johnson A, Grywalski C, Silbergleit A,Jacobson G,Benninger M.S, NewmanC.W. (1997).The Voice Handicap Index (VHI):Development and Validation. American Journal of Speech-Language Pathology.6:66-70. August 1997.
Jalalinajafabadi F.(2012). Automatic Assessment of Voice Signals according to the GRBAS Scale.Retrieved from http://womencourage.acm.org/PostersPDFs/079_JalalinajafabadiFarideh.pdf
Kay Elemetrics Corporation. Operations Manual: Multi-Dimensional Voice Program (MDVP) Model 4305. Lincoln Park, MJ: Kay Elemetrics Corporation; 1993.
KayPENTAX, 2011。http://www.kayelemetrics.com/。
Kent, R. D. and Ball, M. J. (Eds) (2000) Voice Quality Measurement. San Diego: Singular Publishing.
Kent, R.D. & Read , C. (1996). The acoustic analysis of speech. San Diego: Singular Publishing Group.
Kirk k. & Edgerton B. (1983) The effedts of cochlear implant use on voice parameters. Otolaryngologic Clnics of North America.16,281-292.
Klieve S, Jeanes RC. (2001). Perception of prosodic features by children with cochlear implants: Is it sufficient for understanding meaning differences in language?. Deafness and Education International 3(1),15–37.
L.S. Kim, Y.M. Lee, M.J. Huh and Y.D. Park. (2005). Auditory Performance in Children with Cochlear Implants at Dong-A University Hospital. 5th Asia Pacific Symposium on Cochlear Implant and Related Sciences.
Lenden JM, Flipsen P Jr. (2007). Prosody and voice characteristics of children with cochlear implants. J Commun Disord. 40(1), 66-81.
Lisiecka-Bielanowicz, M.; Szuchnik, J.; Ratynska, J.; Szkielkowska, A. (2003). Physiotherapy of breathing as an element of multidisciplinary rehabilitation of children using cochlear implants. International Congress Series. 1240, 375-378.
Mahmoudi Z, Rahati S, Ghasemi MM, Asadpour V, Tayarani H, Rajati M. (2011).Classification of voice disorder in children with cochlear implantation and hearing aid using multiple classifier fusion. Biomed Eng Online.10, 3. doi: 10.1186/1475-925X-10-3.
Mehta DD & Hillman RE.(2008). Voice assessment: Updates on perceptual, acoustic,aerodynamic, and endoscopic imaging methodsCurr Opin Otolaryngol Head Neck Surg. 16(3):211-5. doi: 10.1097/MOO.0b013e3282fe96ce.
Mehrabian, A., & Ferris, S.R. (1967). Inference of attitudes from nonverbal communication in two channels. Journal of Consulting Psychology, 31, 248-252.
Michaelis, D., Frohlich, M., Strube, H.S., Kruse, E., Story, B., & Titze, I.R. (1998). Grenzen der Jitter- und Shimmer-Messung pathologischer Stimmen mit dem unuberwachten Waveform-Matching-Verfahren. Fortschritte der Akustik, DAGA.
Miyamoto RT, Svirsky MA, Robbins AM.(1997).Enhancement of expressive language in prelingually deaf children with cochlear implants.Acta Otolaryngol.117(2),154-7.
Mondain M., Sillon M., Vieu A., Levi A., Reuillard-Artieres F., Deguine O., Fraysse B., Cochard N., Truy E., & Uziel A. (2002).Cochlear implantation in prelingually deafened children with residual hearing.Int J Pediatr Otorhinolaryngol.63(2),91-7.
Monini S, Banci G, Barbara M, Argiro MT, Filipo R. (1997).Clarion cochlear implant: short-term effects on voice parameters.Am J Otol.18(6),719-25.
Moog JS, Geers AE. (1999).Speech and language acquisition in young children after cochlear implantation.Otolaryngol Clin North Am.32(6):1127-41.
Murray IR, Arnott JL. (1993). Toward the simulation of emotion in synthetic speech: a review of the literature on human vocal emotion. J Acoust Soc Am. 93(2):1097-108.
Nakata T, Trehub SE, Kanda Y.(2012).Effect of cochlear implants on children's perception and production of speech prosody. J Acoust Soc Am. 131(2),1307-14. doi: 10.1121/1.3672697.
Nemr K, Simões-Zenari M, Cordeiro GF, Tsuji D, Ogawa AI, Ubrig MT, Menezes MH.(2012). GRBAS and Cape-V scales: high reliability and consensus when applied at different times. J Voice.26(6):812.e17-22. doi: 10.1016/j.jvoice.2012.03.005. Epub 2012 Sep 29.
Nickerson, R. S. (1975). Characteristics of the speech of deaf persons. The Volta Review, 77(6), 342-363.
Nolan, B.& Winkworth, A.(2003).characteristics of the ageing voice and management issues.ACQuiring Knowledge in Speech, Language and Hearing, 5 (3):142-144.
Owens D, Espeso A, Hayes J, & Williams RG. (2006). Cochlear implants: Referral, selection and rehabilitation. Current Paediatrics 16(5):360-365.
Patel RR, Pickering J, Stemple J, Donohue KD.(2012).A case report in changes in phonatory physiology following voice therapy: application of high-speed imaging.J Voice.26(6):734-41. doi: 10.1016/j.jvoice.2012.01.001. Epub 2012 Jun 19.
Peng SC, Tomblin JB, Turner CW. (2008).Production and perception of speech intonation in pediatric cochlear implant recipients and individuals with normal hearing.Ear Hear. 29(3),336-51. doi: 10.1097/AUD.0b013e318168d94d.
Perrin E, Berger-Vachon C, Topouzkhanian A, Truy E, Morgon A. (1999).Evaluation of cochlear implanted children's voices. Int J Pediatr Otorhinolaryngol.47(2),181-6.
Perrin E, Berger-Vachon C, Topouzkhanian A, Truy E, Morgon A. (1999).Evaluation of cochlear implanted children's voices.Int J Pediatr Otorhinolaryngol. 47(2),181-6.
Poissant SF, Peters KA, Robb MP. (2006). Acoustic and perceptual appraisal of speech production in pediatric cochlear implant users. Int J Pediatr Otorhinolaryngol. 70(7),1195-203.
Portone CR, Hapner ER, McGregor L, Otto K, Johns MM 3rd.(2007).Correlation of the Voice Handicap Index (VHI) and the Voice-Related Quality of Life Measure (V-RQOL).J Voice.21(6):723-7. Epub 2006 Aug 1.
Radhakrishnan N, Scheidt T. (2012).Modified vocal function exercises: a case report.Logoped Phoniatr Vocol. 37(3):123-6. doi: 10.3109/14015439.2012.664655. Epub 2012 Mar 13.
Raes, J.,Wuyts, Floris,Bodt de Marc,Clement, P. (2002). The dysphonia severity index used with a percentage scale. Stem-, spraak- en taalpathologie, 11(1), 30-37.
Ramig LO, Gray S, Baker K, Corbin-Lewis K, Buder E, Luschei E, Coon H, Smith M.(2001).The aging voice: a review, treatment data and familial and genetic perspectives. Folia Phoniatr Logop. 53(5):252-65. Review.
Robbins AM, Svirsky M, Kirk KI.(1997).Children with implants can speak, but can they communicate?. Otolaryngol Head Neck Surg.117(3 Pt 1),155-60.
Rosen CA, Lee AS, Osborne J, Zullo T, Murry T.(2004).Development and validation of the voice handicap index-10.Laryngoscope.114(9):1549-56.
Roy N., Merrill R.M., Thibeault S., Parsa R.A., Gray S.D., Smith E.M. (2004).Prevalence of voice disorders in teachers and the general population.J Speech Lang Hear Res.47(2),281-93.
Sabol JW, Lee L, Stemple JC.(1995).The value of vocal function exercises in the practice regimen of singers.J Voice.9(1):27-36.
Sauder C, Roy N, Tanner K, Houtz DR, Smith ME. (2010).Vocal function exercises for presbylaryngis: a multidimensional assessment of treatment outcomes.Ann Otol Rhinol Laryngol.119(7):460-7.
Schow, R.L. & Nerbonne, M.A. (2013). Introduction to Audiologic Rehabilitation, Sixth Edition. Boston, Allyn and Bacon.
Seifert E, Oswald M, Bruns U, Vischer M, Kompis M, Haeusler R. (2002).Changes of voice and articulation in children with cochlear implants.Int J Pediatr Otorhinolaryngol.66(2),115-23.
Sellars, C., Stanton, A.E., McConnachie, A., Dunnet, C.P., Chapman, L.M., Bucknell, C.E. and Mackenzie, K. (2009) Reliability of perceptions of voice quality: evidence from a problem asthma clinic population.Journal of Laryngology and Otology. 123 (7),755-763.
Shriberg, L. D., Kwiatkowski, J., & Rasmussen, C. (1990). The Prosody Voice Screening Profile. Tucson, AZ: Communication Skill Builders.
Smith C.R. (1975). Residual Hearing and Speech Production in Deaf Children. Journal of Speech and Hearing Research.18,795-811.
Spencer, P.E. & Marschark, M. (Eds) (2006). Advances in the Spoken Language Language Development of Deaf and Hard-of-Hearing Children. New York: Oxford University Press.
Stemple J .(2000). Voice Therapy: Clinical Studies, (2nd ed.). Delmar Learning, Clifton Park, NJ.
Stemple J, Glaze L, Klaben B (2000) Clinical Voice Pathology: Theory and Management, (3rd ed.). Delmar Learning, Clifton Park, NJ.
Stemple JC, Lee L, D'Amico B, Pickup B.(1994). Efficacy of vocal function exercises as a method of improving voice production. J Voice. 8(3):271-8.
Szyfter W, Pruszewicz A, Woznica B, Swidzinski P, Szymiec E, Karlik M.(1996).The acoustic analysis of voice in patients with multi-channel cochlear implant. Rev Laryngol Otol Rhinol (Bord). 117(3),225-7.
Takahashi, H.,and Koike, Y. (1975). Some perceptual dimensions and acoustical corelates of pathologic voices. Acta Otolaryngologica, suppl. 338,1-24.
Tawney, J. W., & Gast, D. (1984). Single subject research in special education. Columbus : A Bell & Howell Company.
Tay EY, Phyland DJ, Oates J. (2012).The effect of vocal function exercises on the voices of aging community choral singers.J Voice. 26(5):672.e19-27. doi: 10.1016/j.jvoice.2011.12.014. Epub 2012 Jun 19.
U.S. Food and Drug Administration.What is a Cochlear Implant? Retrieved August 09, 2010, from http://www.fda.gov/MedicalDevices/ProductsandMedicalProcedures/ImplantsandProsthetics/CochlearImplants/ucm062823.htm#c2
Valero Garcia J, Rovira JM, Sanvicens LG. (2010). The influence of the auditory prosthesis type on deaf children's voice quality.Int J Pediatr Otorhinolaryngol. 74(8),843-8. doi: 10.1016/j.ijporl.2010.04.011.
Van Lierde KM, Vinck BM, Baudonck N, De Vel E, Dhooge I.(2005).Comparison of the overall intelligibility, articulation, resonance, and voice characteristics between children using cochlear implants and those using bilateral hearing aids: a pilot study.Int J Audiol.44(8),452-65.
Wilson BS.(2000) Cochlear implant technology. In: Niparko JK, ed. Cochlear Implants:Principles & Practices. Philadelphia, PA: Lippincott Williams &Wilkins.109-119.
Wuyts FL, De Bodt MS, Molenberghs G, Remacle M, Heylen L, Millet B, Van Lierde K, Raes J, Van de Heyning PH.(2000).The dysphonia severity index: an objective measure of vocal quality based on a multiparameter approach.J Speech Lang Hear Res.43(3),796-809.
Ylitalo R, Hammarberg B. (2000).Voice characteristics, effects of voice therapy, and long-term follow-up of contact granuloma patients. J Voice.14(4):557-66.
Yuba T, Itoh T, Kaga K.(2009). Unique technological voice method (The YUBA Method) shows clear improvement in patients with cochlear implants in singing.J Voice. 23(1),119-24.
Yuba T, Itoh T, Yamasoba T, Kaga K. (2008).Advancement in singing ability using The YUBA Method in patients with cochlear implants.Acta Otolaryngol.128(4),465-72. doi:10.1080/00016480701765683.
Yuba T.( 2000).Method for curing motor-related off-key singing. Jpn J Logop Phoniatr.41. 250-254.
Yuba T.( 2003). Cause of off-key singing and its curative education. J Indian Musicol Soc. 34. 75-82.