Open access peer-reviewed chapter
By Koushik Pal, G. Ghosh and M. Bhattacharya
Submitted: May 31st 2011Reviewed: December 4th 2011Published: May 16th 2012
© 2012 The Author(s). Licensee IntechOpen. This chapter is distributed under the terms of the Creative Commons Attribution 3.0 License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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