1. F. Garofalo, ?Fundamentals of Creep and Creep-Rupture in Metals? (The MacMillan Company, New York, 1965).
2. R. S�derberg, ?Fracture 1969? (Chapman and Hall, London, 1969), p. 450.
3. U. Lindborg,Acta Metallurgica 17 (1969) 157.
4. R. S�derberg, work in progress.
5. E. Shapiro andG. E. Dieter,Met. Trans. 2 (1971) 1385.