Open access peer-reviewed chapter
By Tuulia Huhtala and Ale Närvänen
Submitted: April 29th 2011Reviewed: September 26th 2011Published: June 29th 2012
DOI: 10.5772/34263
Downloaded: 2554
© 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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