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3. L. Graf:Proc. of Conference on Fundamental Aspects of Stress Corrosion Cracking, The Ohio State University, Columbus, OH, NACE, 1969, p. 187.
4. R.G. Johnston:Sheet Metal Ind., 1940, vol. 14, p. 1197.
5. A.V. Bobylev:Intercrystalline Corrosion and Corrosion of Metals under Stress, I. A. Levin, ed., published by Leonard Hill (Books Ltd), London, 1963, p. 298.