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- [47] GENERALIZED PERTURBATION-THEORY - QUALITY OF 1ST-ORDER WAVE-FUNCTION THEORETICA CHIMICA ACTA, 1977, 44 (02): : 201 - 213
- [50] MODIFIED POTENTIALS IN MANY-BODY PERTURBATION-THEORY PHYSICAL REVIEW A, 1976, 13 (01): : 1 - 12