Open access
Submitted: April 27th, 2011 Published: May 23rd, 2012
DOI: 10.5772/34054
From the Edited Volume
Edited by Enri Damanhuri
Submitted: April 27th, 2011 Published: May 23rd, 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.