Open access peer-reviewed chapter
By Spaska Stanilova
Submitted: February 17th 2011Reviewed: August 3rd 2011Published: February 10th 2012
DOI: 10.5772/27341
Downloaded: 2016
© 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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