This paper was presented at the 13th International ESAFORM Conference on Material Forming, University of Brescia, Italy, April 7-9 2010, and published as International Journal of Material Forming, 2010, 3 (s1), pp. 791-795. The final published version is available at http://www.springerlink.com/, Doi: 10.1007/s12289-010-0889-7.
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