1. J. E. Harris,Trans. Met. Soc. AIME 233 (1965) 1509.
2. M. T. Evans, unpublished research (1978).
3. B. Lisowyj, PhD thesis, University of Leeds (1978).
4. J. E. Harris,J. Nucl. Mater. 15 (3) (1965) 201.
5. E. Ross, unpublished research and private communication (1981).