1. J.F. Kalthoff, W. Bohme, S. Winkler and W. Klemm, in Proceedings 5th International Conference on Fracture, Cannes, 1 Pergamon (1985) 363?373.
2. J.G. Williams, Fracture Mechanics of Polymers, Ellis Horwood (1984) Chapter 8.
3. D. Ireland, in Proceedings, International Conference on Dynamic Fracture Toughness, Welding Institute, London (1976).
4. J.G. Williams International Journal of Fracture 33 (1987), in publication.
5. W. Bohme and J.F. Kalthoff, Journal Physique, Collogue C5, supplement No. 8, 46 (1985).