1. N. Ryum, B. Haegland andT. Lindveit,Z. Metallkde 58 (1967) 28.
2. N. Ryum,Acta Metall. 16 (1968) 327.
3. Idem, ibid. 17 (1969) 821.
4. H. A. Lipsitt andC. M. Sargent, Proceedings of the International Conference on Strength of Metals and Alloys (ASM, 1970) p. 937.
5. H. A. Lipsitt,Met. Trans 2A (1971) 1739.