Open access peer-reviewed chapter
By Ferdinand Ngoula, Omer Bébé Ngouateu, Jean Raphaël Kana, Henry Fualefac Defang, Pierre Watcho, Pierre Kamtchouing and Joseph Tchoumboué
Submitted: March 4th 2011Reviewed: July 26th 2011Published: January 5th 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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