@inproceedings{ni_sakai_shimizu_nakamura_2009, 
  title={CART-based modeling of Chinese tonal patterns with a functional model tracing the fundamental frequency trajectories}, 
  DOI={10.1109/icassp.2009.4960568}, 
  publisher={IEEE}, 
  author={Ni and Sakai and Shimizu and Nakamura}, 
  year={2009}
  }