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- [2] RELATIVISTIC PERTURBATION-THEORY CALCULATION OF 2-ELECTRON DOUBLY-EXCITED STATES PHYSICA SCRIPTA, 1994, 50 (01): : 29 - 44
- [4] APPROXIMATE INVARIANCE FOR ELECTRON CORRELATION IN DOUBLY-EXCITED STATES BULLETIN OF THE AMERICAN PHYSICAL SOCIETY, 1978, 23 (09): : 1085 - 1085