1. .D.Chitaley and F.A. McClintock,Journal of the Mechanics and Physics of Solids 19 (1971) 147?163.
2. L.I. Slepjan,Mekhanika Tverdogo Tela 9 (1974) 57?67.
3. Yu-chen Gao,Acta Mechanica Sinica (1980) 48?56 (in Chinese).
4. J.R. Rice, W.J. Drugan and T.L. Sham, inFracture Mechanics, A.S.T.M. STP 700 (1980).
5. Yu-chen Gao and Keh-chih Hwang, inProceedings IUTAM Symposium on Three Dimensional Constitutive Relationships and Ductile Fracture, Ed. S. Nemat-Nasser (1980).