1. Myhra, S., Gardiner, R.B.: Radiat. Eff. 27 (1975) 35.
2. Kobiyama, M., Takamura, S.: Radiat. Eff. 84 (1985) 161.
3. Mehrer, H. (ed.): Landolt-Börnstein, New Series, Vol. III/28, Berlin: Springer 1990.
4. Ryan, E.A., Jackson, J.J., Lwin, Y.N.: Radiat. Eff. 51 (1980) 69.