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 Can you also check the following 
references: 
Andrianopoulos, MV., Darrow, 
K. and Chen, J. ?Multimodal Standardization of Voice Among Four Multicultural 
Populations: Fundamental Frequency and Spectral Characteristics.?  In Journal of Voice,Vol 15(2), 
2001 Andrianopoulos, MV., Darrow, K. and Chen, J. ?Multimodal Standardization of Voice Among Four Multicultural Populations: Formant Structures.? In Journal of Voice,Vol 15(1): 61-77, 2001 
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