@inproceedings{lung2012analysis,
  title={Analysis of Vietnamese tones to optimize database in speech synthesis using unit selection method},
  author={Lung, Vu Duc and Van Hung, Cao and Loc, Nguyen Phuoc and Quoc, Nguyen Viet},
  booktitle={Signal Processing and Information Technology (ISSPIT), 2012 IEEE International Symposium on},
  pages={000043--000048},
  year={2012},
  organization={IEEE}
}