Open access peer-reviewed chapter
By Maxwell N. Opara
Submitted: June 8th 2011Reviewed: November 2nd 2011Published: April 4th 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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