1. 1) B.I. EDELSON and W.M. BOLDWIN: Trans. ASM, 55 (1962), p.230
2. 2) C.T. LIU and J. GURLAND: Trans. ASM 61 (1968), p.156
3. 4) F.A. MCCLINTOCK: Ductility (1968), p.255 ASM
4. 5) L. ROESCH: Mem. Sci. Rev. Met., 66 (1969), p.29
5. 6) D. BROEK: A Study on Ductile Fracture (1971) Ph. D. Thesis of Delft Tech. Univ.