1. Dworschak, F., Koehler, J.S.: Phys. Rev. 140 (1965) A941.
2. Coltman, R.R., Klabunde, C.E., Redman, J.K.: Phys. Rev. 156 (1967) 715.
3. Piani, C.S.B., Aspeling, J.C.: Radiat. Eff. 69 (1983) 19 and 29.
4. Guinan, M.W., Kinney, J.H., van Konynenburg, R.A.: J. Nucl. Mater. 133/134 (1985) 357.
5. Schilling, W., Burger, G., Isebeck, K., Wenzl, H.: see [70b1], p. 255.