Open access peer-reviewed chapter
By Mariana Chirea
Submitted: May 3rd 2011Reviewed: November 9th 2011Published: March 9th 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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