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Tang, P., Xu Rattanasone, N., Yuen, I., & Demuth, K. (2017). Phonetic enhancement of Mandarin vowels and tones: Infant-directed speech and Lombard speech. The Journal of the Acoustical Society of America, 142(2), 493–503. doi:10.1121/1.4995998 
10.1121/1.4995998