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- [3] ON SINGULAR PERTURBATION PROBLEMS IN QUANTUM-MECHANICS INDIAN JOURNAL OF PURE & APPLIED MATHEMATICS, 1983, 14 (08): : 1007 - 1025
- [4] SUMMATION OF PERTURBATION SERIES IN QUANTUM-MECHANICS PHYSICAL REVIEW D, 1973, 7 (04): : 1018 - 1027
- [9] DEGENERATE PERTURBATION-THEORY IN QUANTUM-MECHANICS PROGRESS OF THEORETICAL PHYSICS, 1983, 70 (02): : 439 - 451
- [10] ON THE STATIONARY PERTURBATION-THEORY IN QUANTUM-MECHANICS IZVESTIYA VYSSHIKH UCHEBNYKH ZAVEDENII FIZIKA, 1980, (11): : 33 - 36