1. M. P. Seah andE. D. Hondros,Int. Met. Rev. 222 (1977) 262.
2. E. D. Hondros andD. Mclean, ?Surface Phenomena of Metals? Vol.28 (London Society of Chemical Industry, London, 1968) p. 39.
3. M. Guttemann,Metel Sci. 10 (1976) 337.
4. D. Mclean, ?Grain Boundaries in Metals? (Clarendon Press, Oxford, 1957) p. 131.
5. M. P. Seah,Acta. Met. 25 (1977) 345.