1. Kornelsen, E.V. Radiation Effects 13 (1972) 227.
2. Erents, S.K. and G. Carter, Brit. J. Appl. Phys.(J.PHys D) 1 (1986) 1323.
3. Erents, S.K., G. Farrell and G. Carter, Proc. 4th Intern.Vac.Congress Manchester U.K. Inst. Phys. London (1968) 145.
4. Recknagel, E. and Th. Wiehert, Nucl. Instr. Meth. 182 /183 (1981) 439.
5. Pleiter, F. and Ch. Hohenemser, Phys.Rev. B25 (1982) 106.