Open access peer-reviewed chapter
By S. Alford, W. Barber, G. Cheung and K. Thoirs
Submitted: October 30th 2011Reviewed: November 22nd 2011Published: February 3rd 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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