1. W. H. Bragg and W. L. Bragg, Proc. Roy. Soc. London, 88, 428 (1913); 89, 246 (1913).
2. C. K. Johnson and H. A. Levy, International Tables for X-Ray Crystallography, Vol. IV, pp. 311–336 (1974).
3. I. Waller, Phil. Mag., 4, 1228 (1927).
4. P. M. Platzman and N. Tzoar, Phys. Rev., B2, 3556 (1970).
5. V. Florescu and M. Gavrila, Phys. Rev., A14, 211 (1976).