1. D. Broek, The Practical Use of Fracture Mechanics, Kluwer Academic Publishers, Dordrecht, The Netherlands (1988) 243?281.
2. D.L. Chen, B. Weiss and R. Stickler, International Journal of Fracture 55 (1992) R3-R8.
3. D.L. Chen, B. Weiss, R. Stickler, A. Hadrboletz and Z.G. Wang, in Proceedings of 1st Materials Science Symposium, D.L. Chen et al. (eds.), Chinese Association of Science and Technology in Austria (CASTA), Vienna (1993) 20?31.
4. D.L. Chen, B. Weiss and R. Stickler, International Journal of Fracture 56 (1992) R19-R22.