1Clough R W. The finite dement method in plane stress analysis//ASCE. Proceedings of the second ASCE conference on electronic computation. ASCE, 1960: 345-350.
7Hardt D E, Olsen B A, Allison B T, et al. Sheet metal forming with discrete die surface// Proceedings of the 9th NAMRC. 1981: 140-144.
8Papazian J M. Tools of change: Rcconfigurable forming dies raise the efficiency of small-lot production. Mechanical Engineering, 2002, 124: 52-55.
9Papazian J M, Anagostou E L, Christ R J, et al. Tooling for rapid sheet metal parts production//Proceedings of 6th Joint FAA/ DoD/NASA conference on aging aircraft. San Francisco, 2009.
