Hehre, W. J.; R. F. Stewart; J. A. Pople (1969). “Self-Consistent Molecular-Orbital Methods. I. Use of Gaussian Expansions of Slater-Type Atomic Orbitals”. Journal of Chemical Physics51 (6): 2657–2664. Bibcode: 1969JChPh..51.2657H. doi:10.1063/1.1672392.
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Hehre, W. J.; R. F. Stewart; J. A. Pople (1969). “Self-Consistent Molecular-Orbital Methods. I. Use of Gaussian Expansions of Slater-Type Atomic Orbitals”. Journal of Chemical Physics51 (6): 2657–2664. Bibcode: 1969JChPh..51.2657H. doi:10.1063/1.1672392.