1. J. C. Slater, Phys. Rev. 51, 846 (1931)
2. L. F. Mattheiss, J. H. Wood, and A. C. Switendick in Methods In Computational Physics, Academic Press, New York (1968) give an exhaustive description of this method.
3. We restrict ourselves to a crystal containing one atom at the origin of each unit cell.
4. J. C. Slater, Phys. Rev. 92, 603 (1953); M. M. Saffren and J. C. Slater, Phys. Rev. 92, 1126 (1953).
5. D. J. Howarth, Phys. Rev 99 (1955).