Open access
Submitted: November 13th, 2010 Published: April 25th, 2012
DOI: 10.5772/21411
From the Edited Volume
Edited by Giuseppe Montanaro and Bartolomeo Dichio
Submitted: November 13th, 2010 Published: April 25th, 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.