Open access peer-reviewed chapter
By Roland E. Winkler, Peter Ahrenholz and Klaus Freivogel
Submitted: November 24th 2010Reviewed: April 12th 2011Published: November 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.
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