1. Elliott, R.O., Olsen, C.E.: Studies in Radiation Effects on Solids Ser. A, Phys. and Chem. 1, Dienes, G.J. (ed.), New York: Gordon and Breach 1966, p. 1.
2. Zanghi, J.P., Calais, D., Boidron, M.: J. Nucl. Mater. 62 (1976) 105.
3. Asch, L., Potzel, W., Beck, O., Spirled, J.C., Müller, W., Kalvius, G.M.: Hyperfine Interact. 10 (1981) 663.
4. Corbel, C., Bois, P., Moser, P., Lemahieu, I.: Mater. Sci. Forum 15/18 (1987) 721.
5. Lemahieu, I., Dorikens-Vanpraet, L., Segers, D., Dorikens, M., Moser, P., Corbel, C., Bois, P.: Phys. Status Solidi (a) 102 (1987) 659.