Open access peer-reviewed chapter
By Michele Abate and Vincenzo Salini
Submitted: February 11th 2011Reviewed: July 14th 2011Published: March 2nd 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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