Open access
Submitted: 21 January 2011 Published: 02 May 2012
DOI: 10.5772/25319
From the Edited Volume
Edited by Manuela Chessa, Fabio Solari and Silvio P. Sabatini
Submitted: 21 January 2011 Published: 02 May 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.