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Handy, Nicholas C.; Schaefer, Henry F. (1984). “On the evaluation of analytic energy derivatives for correlated wave functions”. The Journal of Chemical Physics81 (11): 5031. Bibcode: 1984JChPh..81.5031H. doi:10.1063/1.447489.
Hubač, Ivan; Čársky, Petr (1980). “Correlation energy of open-shell systems. Application of the many-body Rayleigh-Schrödinger perturbation theory in the restricted Roothaan-Hartree-Fock formalism”. Physical Review A22 (6): 2392–2399. Bibcode: 1980PhRvA..22.2392H. doi:10.1103/PhysRevA.22.2392.
Amos, Roger D.; Andrews, Jamie S.; Handy, Nicholas C.; Knowles, Peter J. (1991). “Open-shell Møller—Plesset perturbation theory”. Chemical Physics Letters185 (3–4): 256–264. Bibcode: 1991CPL...185..256A. doi:10.1016/S0009-2614(91)85057-4.
Knowles, Peter J.; Andrews, Jamie S.; Amos, Roger D.; Handy, Nicholas C.; Pople, John A. (1991). “Restricted Møller—Plesset theory for open-shell molecules”. Chemical Physics Letters186 (2–3): 130–136. Bibcode: 1991CPL...186..130K. doi:10.1016/S0009-2614(91)85118-G.
Lauderdale, Walter J.; Stanton, John F.; Gauss, Jürgen; Watts, John D.; Bartlett, Rodney J. (1991). “Many-body perturbation theory with a restricted open-shell Hartree—Fock reference”. Chemical Physics Letters187 (1–2): 21–28. Bibcode: 1991CPL...187...21L. doi:10.1016/0009-2614(91)90478-R.
Kozlowski, P. M.; Davidson, Ernest R. (1994). “Construction of open shell perturbation theory invariant with respect to orbital degeneracy”. Chemical Physics Letters226 (5–6): 440–446. Bibcode: 1994CPL...226..440K. doi:10.1016/0009-2614(94)00763-2.
Murray, Christopher W.; Handy, Nicholas C. (1992). “Comparison and assessment of different forms of open shell perturbation theory”. The Journal of Chemical Physics97 (9): 6509. Bibcode: 1992JChPh..97.6509M. doi:10.1063/1.463680.
Nakano, Haruyuki (1993). “Quasidegenerate perturbation theory with multiconfigurational self-consistent-field reference functions”. The Journal of Chemical Physics99 (10): 7983–7992. Bibcode: 1993JChPh..99.7983N. doi:10.1063/1.465674.
Granovsky, A. A. (2011). “Extended multi-configuration quasi-degenerate perturbation theory: The new approach to multi-state multi-reference perturbation theory”. J. Chem. Phys.134 (21): 214113. Bibcode: 2011JChPh.134u4113G. doi:10.1063/1.3596699. PMID21663350.
Glaesemann, Kurt R.; Gordon, Mark S.; Nakano, Haruyuki (1999). “A study of FeCO+ with correlated wavefunctions”. Physical Chemistry Chemical Physics1 (6): 967–975. Bibcode: 1999PCCP....1..967G. doi:10.1039/a808518h.
Granovsky, A. A. (2011). “Extended multi-configuration quasi-degenerate perturbation theory: The new approach to multi-state multi-reference perturbation theory”. J. Chem. Phys.134 (21): 214113. Bibcode: 2011JChPh.134u4113G. doi:10.1063/1.3596699. PMID21663350.