1. T. B. Reed et al., Metallurgy of Advanced Electronic Materials Conference, Pennsylvania 71 (1963).
2. Powder Diffraction File, Joint Committee on Powder Diffraction Standards, (ASTM, 1968 ).
3. Nb3Sn sample supplied by H. L. Luo, University of California, La Jolla, California.
4. L. L. Makarov et al., J. Research Institute for Catalyses, Hokkaido University, 24, 102 (1976).
5. K. Das Gupta, Phys. Rev. 80, 281 (1950).