Open access peer-reviewed chapter
By S. Stoyanov, H. Zedan, E. Doychev, V. Valkanov, I. Popchev, G. Cholakov and M. Sandalski
Submitted: May 27th 2011Reviewed: October 24th 2011Published: March 2nd 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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