Open access peer-reviewed chapter
By Rumena Petkova, Stoian Chakarov and Varban Ganev
Submitted: February 9th 2011Reviewed: July 17th 2011Published: March 30th 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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