Open access peer-reviewed chapter
By Andreea Irina Barzic, Iuliana Stoica and Camelia Hulubei
Submitted: December 21st 2011Reviewed: September 20th 2012Published: December 19th 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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