1. R. W. JAMES, in “Optical Principal of X-ray Diffraction” (Bell, London, 1967) p. 220.
2. B. E. WARREN, in “X-ray diffraction” (Addison Wesley, MA, 1969) p. 151.
3. B. T. M. WILLIS and A. PRYOR, in “Thermal Vibrations in Crystallography” (Cambridge University Press, 1975).
4. F. A. LINDEMANN, Physik. Z.
11 (1910) 609.
5. S. S. MITRA and P. K. JOSHI, Physica
26 (1960) 284.