Open access
Submitted: February 12th, 2011 Published: February 17th, 2012
DOI: 10.5772/26856
From the Edited Volume
Edited by Kenneth R. Zaslav
Submitted: February 12th, 2011 Published: February 17th, 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.