Open access peer-reviewed chapter
By André Rex and Heidrun Fink
Submitted: February 4th 2011Reviewed: July 29th 2011Published: October 26th 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.
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