For a review of the Hartree-Fock-Slater model, see J. C. Slater: Quantum Theory of Molecules and Solids (McGraw-Hill, 1974) Vol. 4.
D. E. Ellis and G. S. Painter: Phys. Rev. B2 (1970) 2887.
A. Rosen, D. E. Ellis, H. Adachi and F. W. Averill: J. chem. Phys. 65 (1976) 3629.
K. H. Johnson: J. chem. Phys. 45 (1966) 3085.
K. H. Johnson, J. G. Norman, Jr. and J. W. D. Connolly: Computational Methods for Large Molecules and Locarized States in Solids (Plenum, 1973) p. 161.