Open access peer-reviewed chapter
By Rosaria Meccariello, Rosanna Chianese, Silvia Fasano and Riccardo Pierantoni
Submitted: November 28th 2011Reviewed: April 6th 2012Published: February 20th 2013
© 2013 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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