1. Iwasaki Y, Shiota H, Taura Y. Development of a triple-row-press. Mitsubishi Heavy Industries, Technical review, 1977.
2. Hardt DE, Olsen BA, Allison BT, Pasch K. Sheet metal forming with discrete die surfaces. Proceedings of ninth NAMRC. 1981. p. 140–4.
3. Sheet metal die forming using closed loop shape control;Hardt;Ann CIRP,1982
4. A CAD driven flexible forming system for three dimensional sheet metal parts;Hardt,1993
5. Design and analysis of reconfigurable discrete dies for sheet metal forming;Walczyk;J Manuf Syst,1998