1. J. C. Scully, ?The Fundamentals of Corrosion?, 2nd Edn. (Pergamon Press, Oxford, 1981) p. 45.
2. C. Nickolds, M. J. Nasir, G. Cliff andG. W. Lorimer, Institute of Physics Conference Series No. 52 (Institute of Physics, 1980) Ch. 9, p. 417.
3. M. E. Twigg andH. L. Fraser, in ?Microbeam Analysis?, edited by K. F. J. Heinrich (San Francisco Press, California, 1982) p. 37.
4. A. J. Bourdillon, Proceedings of the 40th EMSA meeting, Washington, edited by G. W. Bailey (Claitors Publishing Division, Baton Rouge, 1982) p. 510.
5. ?Metals Handbook?, Vol. 8 (American Society for Metals, Ohio, 1973) p. 402.