Open access peer-reviewed chapter
By Ruth Broering, Mengji Lu and Joerg F. Schlaak
Submitted: February 3rd 2011Reviewed: July 11th 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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