Open access peer-reviewed chapter
By Marcela Krečmerová
Submitted: February 23rd 2011Reviewed: August 1st 2011Published: March 7th 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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