Stewart, Robert F. (1 January 1970). "Small Gaussian Expansions of Slater‐Type Orbitals". The Journal of Chemical Physics. 52 (1): 431–438. doi:10.1063/1.1672702.
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 Physics. 51 (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 Physics. 51 (6): 2657–2664. Bibcode:1969JChPh..51.2657H. doi:10.1063/1.1672392.
