1. 1) A. M. BELTRAN and D. A. SHORES : The superalloys (1972), p. 317 [John Wiley & Sons. Inc.]
2. 3) S. J. GRISAFFE : The Superalloys (1972), p. 341 [John Wiley & Sons. Inc.]
3. 4) J. H. WESTBROOK : Intermetallic compounds (1967) [John Wiley & Sons. Inc.]
4. 6) F. S. PETTIT : Trans. TMS-AIME, 239 (1967), p. 1296
5. 7) J. D. KUENZLY and D. L. DOUGLASS : Oxid. Metals, 8 (1974), p. 139