1. Quantum Theory of Many-Particle Systems. III. Extension of the Hartree-Fock Scheme to Include Degenerate Systems and Correlation Effects
2. Improved Quantum Theory of Many-Electron Systems. I. Construction of Eigenfunctions ofS^2Which Satisfy Pauli's Principle
3. Löwdin, P.O. 1953.Symposiums on Molecular Physics, 13–13. Tokyo: Maruzen Co.Pauncz, R., 1967,Alternant Molecular Orbital Method(Philadelphia: W. B. Sanders).
4. Wigner, E.P. 1959.Group Theory, 128 ff–128 ff. New York: Academic Press, Inc. 256 ff (original German version was published in 1931).
5. Löwdin, P.O. 1958.Calcul des Fonctions d'Onde Moléculaires, 23–23. Paris: CNRS. 1964,Rev. mod. Phys.,36,966.