L. Li, H. Wang, T. Chin, D. Suter, and S. Zhang. Image and Signal Processing (CISP), 2010 3rd International Congress on, 4, page 1586 -1589. (October 2010)
T. Masuko, T. Kobayashi, M. Tamura, J. Masubuchi, and K. Tokuda. Proceedings of the 1998 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP), 6, page 3745-3748. Seattle, WA, USA, (May 1998)