Open access peer-reviewed chapter
By Teresita Betancur V., Carlos Alberto Palacio T. and John Fernando Escobar M.
Submitted: February 24th 2011Reviewed: October 10th 2011Published: February 10th 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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