Open access peer-reviewed chapter
By Carlo Gostoli
Submitted: November 12th 2010Reviewed: May 2nd 2011Published: November 4th 2011
© 2011 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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