1987, 26, 846–878. [CrossRef] 27. Wolfsberg, M.; Helmholz, L. The Spectra and Electronic Structure of the Tetrahedral Ions MnO4−, CrO4−, and ClO4−. J. Chem. Phys. 1952, 20, 837–843. [CrossRef] 28. Slater, J.C. Wave Functions in a Periodic Potential. Phys. Rev. ...