1. M. N. Kabler, in Radiation Damage Processes in Materials ( C. H. S. Dubuy, ed.) Noordhoff International Publishing, Leyden (1975).
2. J. H. Crawford, Jr. and J. M. Slifkin, Point Defects in Solids, Vol. 1, Plenum Press, New York-London (1972).
3. A. M. Stoneham, Theory of Defects in Solids, Clarendon Press, Oxford (1975).
4. T. L. Gilbert, Lecture notes for the NATO Advanced Study Institute, Ghent, 1966, unpublished.
5. N. F. Mott and A. M. Stoneham, J. Phys. C: Solid State Phys. 10, 3391 (1977).