1. D. HANSON and M. L. GAYLER,J. Inst. Metals. 27 (1922) 267.
2. M. L. GAYLER, M. HAUGHTON and E. G. SUTHERLAND, ibid.63 (1938) 123.
3. T. MORINAGA,J. Jpn. Inst. Metals 3 (1939) 216.
4. E. BUTCHERS and W. HUME-ROTHERY,J. Inst. Metals 71 (1945) 291.
5. E. GEBHARDT,Z. Metallkde 40 (1949) 136.