Open access peer-reviewed chapter
By Philippe Sciau
Submitted: April 27th 2011Reviewed: December 7th 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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