Hehre, W. J.; Stewart, R. F.; Pople, J. A. (1969-09-15). "Self‐Consistent Molecular‐Orbital Methods. I. Use of Gaussian Expansions of Slater‐Type Atomic Orbitals". The Journal of Chemical Physics. 51 (6): 2657–2664. Bibcode:1969JChPh..51.2657H. doi:10.1063/1.1672392. ISSN0021-9606.
Hehre, W. J.; Stewart, R. F.; Pople, J. A. (1969-09-15). "Self‐Consistent Molecular‐Orbital Methods. I. Use of Gaussian Expansions of Slater‐Type Atomic Orbitals". The Journal of Chemical Physics. 51 (6): 2657–2664. Bibcode:1969JChPh..51.2657H. doi:10.1063/1.1672392. ISSN0021-9606.
Hehre, W. J.; Stewart, R. F.; Pople, J. A. (1969-09-15). "Self‐Consistent Molecular‐Orbital Methods. I. Use of Gaussian Expansions of Slater‐Type Atomic Orbitals". The Journal of Chemical Physics. 51 (6): 2657–2664. Bibcode:1969JChPh..51.2657H. doi:10.1063/1.1672392. ISSN0021-9606.