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2. Rigid Plastic Finite Element Analysis of Ring Compression;Chen;Trans. A.S.M.E.,1978
3. Ein Beitrag zur Berechung istationarer starr-plasticher Formanderungen mit einer Finite-Element-Methode;Dung,1981
4. F.E.M. approach and experimental results in extrusion forging operations;Maccarini,1990
5. F.E.M. approach and experimental results in extrusion operations (in italian);Maccarini,1989