Open access peer-reviewed chapter
By Curtis L. Hancock
Submitted: May 23rd 2011Reviewed: October 10th 2011Published: June 13th 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.
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