1. C. C. J. Roothaan, Revs. Modern Phys. 23, 69 (1951).RMPHAT0034-6861
2. R. McWeeny, Proc. Roy. Soc. (London) A235, 496 (1956).PRLAAZ1364-5021
3. R. Sahni, J. Chem. Phys. 24, 332 (1956).JCPSA60021-9606
4. R. S. Mulliken, J. Chim. Phys. 46, 500 (1949).
5. H. A. Jahn and E. Teller, Proc. Roy. Soc. (London) A161, 220 (1937).PRLAAZ1364-5021