Open access peer-reviewed chapter
By N. Bettahar
Submitted: May 9th 2011Reviewed: December 9th 2011Published: March 16th 2012
DOI: 10.5772/35161
Downloaded: 1641
© 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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