Open access
Submitted: 26 November 2011 Published: 28 August 2013
DOI: 10.5772/55048
From the Edited Volume
Edited by Marco G. Beghi
Submitted: 26 November 2011 Published: 28 August 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.