Open access
Submitted: 18 August 2011 Published: 22 December 2011
DOI: 10.5772/33567
From the Edited Volume
Edited by Mohammed Naguib Abd El-Ghany Hasaneen
Submitted: 18 August 2011 Published: 22 December 2011
© 2011 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.