\bibitem{vook} F. L. Vook in: Radiation Damage and Defects in Semiconductors, ed. by J. E. Whitehouse. Inst. of Phys., London 1972, pp 60.
\bibitem{morehead_crowder} F. F. Morehead, B. L. Crowder. Rad. Eff. 6 (1970) 27.
\bibitem{gibbons} J. F. Gibbons. Proc. IEEE, Vol. 60, No. 9 (1972) 1062.
\bibitem{vook} F. L. Vook in: Radiation Damage and Defects in Semiconductors, ed. by J. E. Whitehouse. Inst. of Phys., London 1972, pp 60.
\bibitem{morehead_crowder} F. F. Morehead, B. L. Crowder. Rad. Eff. 6 (1970) 27.
\bibitem{gibbons} J. F. Gibbons. Proc. IEEE, Vol. 60, No. 9 (1972) 1062.