1. M. J. Buerger, Elementary Crystallography (John Wiley, New York, 1963).
2. R. W. G. Wyckoff, Crystal Structure (Interscience, New York, 1963).
3. N. W. Ashcroft and N. D. Mermin, Solid State Physics (Holt, Rinehardt, and Winston, New York, 1976).
4. C. Kittel, Solid State Physics, 6th edition (John Wiley, New York, 1986).
5. A. L. Mackay, Acta Crystallogr. 15, 916 (1962).