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Ting, H.N. and Chia, S.Y. and Manap, H.H. and Ho, A.H. and Tiu, K.Y. and Abdul Hamid, B. (2012) Fundamental frequency and perturbation measures of sustained vowels in Malaysian Malay children between 7 and 12 years old. The Journal of Voice. ISSN 0892-1997, DOI PMID: 22243972.