1. D. G. Howe and L. S. Weinman:Proc. 5th Intl. Cryo. Eng. Conf., pp. 326–28. May 7–10, 1974, Kyoto, Japan.
2. J. H. N. van Vucht, H. A. C. M. Bruning, H. C. Donkersloot, and A. H. Gomes de Mesquita:Philips Res. Rep., 1964, vol. 19, pp. 407–21.
3. B. N. Das, J. E. Cox, and R. W. Huber: NRL Report 7907, AD-A015944, Naval Research Laboratory, Washington, D.C., September 1975. (Note: Systematic errors were present in the measured intensity for long-range order evaluation; probably caused by the use of a Joham type bent crystal monochromator.)
4. E. Maxwell:Rev. Sci. Instrum., 1965, vol. 36, pp. 553–54.
5. J. E. Cox, J. L. Bostock, and R. M. Waterstrat:Proc. 13th Intl. Conf. on Low-Temp. Phys., K. D. Timmerhaus, W. J. O'Sullivan, and E. F. Hammel, eds., vol. 3, pp. 480–84, Plenum, New York, N.Y., 1974; J. E. Cox, R. A. Hein, and R. M. Waterstrat:Proc. 12th Intl. Conf. on Low-Temp. Phys., E. Kanda, ed., pp. 333–34. Academic Press of Japan, Tokyo, 1971.