Open access peer-reviewed chapter
Submitted: October 20th, 2010Reviewed: August 3rd, 2011Published: December 7th, 2011
DOI: 10.5772/17378
From the Edited Volume
Edited by Juliana Dushanova
Submitted: October 20th, 2010Reviewed: August 3rd, 2011Published: December 7th, 2011
© 2011 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.