Open access peer-reviewed chapter
Submitted: November 15th, 2010 Reviewed: April 11th, 2011 Published: October 5th, 2011
DOI: 10.5772/21677
From the Edited Volume
Edited by Reinhart T. Grundmann
Submitted: November 15th, 2010 Reviewed: April 11th, 2011 Published: October 5th, 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.