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3. E. Clementi, J. Mol. Spectry. 12, 19 (1964).JMOSA30022-2852
4. C. C. J. Roothaan, Rev. Mod. Phys. 23, 69 (1951).RMPHAT0034-6861
5. A. C. Wahl, J. Chem. 41, 2600 (1964).1120-009X