1. Patterson, A. L., Phys. Rev., 55, 682 (1939).
2. cf. "Internationale Tabellen zur Bestimmung von Kristallstrukturen" 1, 322 (Berlin, etc. 1935); or R. W. G. Wyckoff, "Analytical Expression of the Results of the Theory of Space Groups" 127 (Washington 1930).
3. Pauling, L., and Shappell, M. D., Z. Krist., 75, 128 (1930).