A. Greenblatt, J. Abel, and D. Berners. IEEE International Conference on Acoustics Speech and Signal Processing (ICASSP), page 429-432. Dallas, Texas, USA, (2010)
S. Ajitha, T. Kumar, D. Geetha, and K. Kanth. 2010 International Conference on Industrial and Information Systems (ICIIS), page 372--376. IEEE, (August 2010)