1. Circular grid systems: A valuable aid for evaluation sheet forming;Keeler;Sheet Met. Ind.,1969
2. Application of strain analysis to sheet metal forming problems;Goodwin;Metall. Ital.,1968
3. Plastic instability under plane stress;Swift;J. Mech. Phys. Solids,1952
4. Limit strains in the processes of strench-forming sheet metal;Marciniak;Int. J. Mech. Sci.,1967
5. Sheet necking: I. Validity of plane stress assumptions of the long wavelength approximation;Hutchinson,1978