Open access peer-reviewed chapter
By Teodor Lucian Grigorie and Ruxandra Mihaela Botez
Submitted: September 19th 2013Reviewed: January 2nd 2014Published: September 8th 2014
© 2014 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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