Open access
Submitted: 21 February 2011 Published: 29 June 2012
DOI: 10.5772/27659
From the Edited Volume
Edited by Richard Kwong Wai Choy and Tak Yeung Leung
Submitted: 21 February 2011 Published: 29 June 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.