References
- International Tables for Crystallography, Vol. A. Edited by Theo Hahn, Fourth, revised edition, Kluwer Academic Publishers, p. 15 (1995)
- Charles Kittel, Introduction to Solid state Physics. Second Edition, John Wiley & Sons, Inc. p. 7 (1956)
- Suh, I.-H., Oh, I.-K., Yoon, Y. K. and Kim, M.-J., J. of the Korean Physical Society, 19(4), 280-285 (1986)