Open access
Submitted: 25 November 2011 Published: 22 August 2012
DOI: 10.5772/48399
From the Edited Volume
Edited by Vito Bobek
Submitted: 25 November 2011 Published: 22 August 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.