1Simo JC, Taylor RL. A return mapping algorithm for plane stress elastoplasticity. International Journal for Numerical Methods in Engineering, 1986, 22: 649-670.
2Riks E. An incremental approach to the solution of snapping and buckling problems. International Joumalof Solids and Structures. 1979, 15:529- 551.
3I M May,Y Duan.Local arc-Length procedure for strain softening. Computers and Structures.VoI 64,No 1, 1997 297--303.
