Open access
Submitted: April 29th, 2011 Published: April 25th, 2012
DOI: 10.5772/34304
From the Edited Volume
Edited by Giuseppe Montanaro and Bartolomeo Dichio
Submitted: April 29th, 2011 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.