1. M. J. Wahll, D. J. Maykuth and H. J. Hucek, in ?Handbook of Superalloys? (Battelle Press, Columbus, 1979) p. 1.
2. R. W. Fawley, in ?The Superalloys?, edited by C. T. Sims and W. C. Hagel (Wiley, New York, 1972) p. 3.
3. P. S. Kotval, Metallogr. 1 (1969) 251.
4. G. P. Sabol and R. Stickler, Phys. Status Solidi 35 (11) (1969) 11.
5. R. F. Decker and C. T. Sims, in ?The Super-alloys?, edited by C. T. Sims and W. C. Hagel (Wiley, New York, 1979) p. 33.