Open access peer-reviewed chapter
By Michel Garenne
Submitted: November 3rd 2010Reviewed: April 20th 2011Published: October 26th 2011
DOI: 10.5772/19330
Downloaded: 1404
© 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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