1. C. Herring, “A New Method for Calculating Wave Functions in Crystals”, Phys. Rev. 57, 1169 (1940)
2. F. Herman, S. Skillman, “Theoretical Investigation of the Energy Band Structure of Semiconductors”, Proc. Int’l Conf. on Semiconductor Phys. Prague, 1960 ( Publishing House of the Czechoslovak Acad. Sci. )
3. F. Herman, R. L. Kortum, C. D. Kuglin, J. P. Van Dyke, and S. Skillman, “Electronic Structure of Tetrahedrally-Bonded Semiconductors: Empirically Adjusted OPW Energy Band Calculations”, Methods in Computational Physics. B. Alder, S. Fernbach, M. Rotenberg, eds. (Academic Press, New York, 1968), Vol. 8, pp 193.
4. R. N. Euwema, T. C. Collins, D. Shankland, and J. S. DeWitt, “Convergence Study of a Self-Consistent Orthogonalized-Plane-Wave Band Calculation for Hexagonal CdS”, Phys. Rev, 162, 710 (1967)
5. D. J. Stukel, R. N, Euvema, “Self-Consistent Orthogonalized-Plane-Wave Energy-Band Study of Silicon”, Phys. Rev. B1, 1635 (1970)