1. Recent review: H. J. Stein in Radiation Effects in Semiconductors, Ed. J. W. Corbett, G. D. Watkins, Gordon and Breach, 1971; p. 125.
2. Recent review: G. D. Watkins in Radiation Damage and Defects in Semiconductors, Conference Series No. 16, The Institute of Physics, 1972; p. 228.
3. Recent review: F. L. Vook in Radiation Damage and Defects in Semiconductors; Conference Series No. 16, The Institute of Physics, 1972; p. 60.
4. Recent review: W. L. Brown in Radiation Damage and Defects in Semiconductors; Conference Series No. 16, The Institute of Physics, 1972; p. 416.
5. H. J. Pabst, Thesis, 1973, University of Sussex.