Open access peer-reviewed chapter
By Tounkara A., Koné A., Diarra B., Maiga A.I., Oumar A.A., Hammond A.S., Diop S. and Sarro Y.S.
Submitted: November 18th 2010Reviewed: May 20th 2011Published: October 26th 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.
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