1. Proceedings of the International Conference on Dynamic Crack Propagation,Lehigh University, July 10–12, 1972, to be published.
2. Hahn, G. T., Hoagland, R. G., Kanninen, M. F., and Rosenfield, A. R., to be published in Ref. 1
3. Bradley, W. B., and Kobayashi, A. S., Exp. Mech., 10e, 106–113 (March, 1970 ).
4. Bradley, W. B., and Kobayashi, A. S., Eng. Fracture Mech., 3, 317–332 (1971).
5. Kobayashi, A. S., Wade, B. G., and Maiden, D. E., Exp. Mech., 12, (1), 32–37 (1972).