Journal of the Physical Society of Japan 73 (2004) pp. 2604-2607 Explicit Gauge Fixing for Degenerate Multiplets: A Generic Setup for Topological Orders Yasuhiro Hatsugai Progress of Theoretical Physics Vol. 5 No. 2 (1950) pp. 207-212 On the Convergence of the Perturbation Method, II. 2 Tosio Kato Progress of Theoretical Physics Vol. 26 No. 1 (1961) pp. 99-122 Some Converging Examples of the Perturbation Series in the Quantum Field Theory Yusuke Kato Progress of Theoretical Physics Vol. 30 No. 1 (1963) pp. 103-133 Regular Perturbation and Asymptotic Limits of Operators in Quantum Field Theory Yusuke Kato and Nobumichi Mugibayashi Progress of Theoretical Physics Vol. 70 No. 2 (1983) pp. 439-451 Degenerate Perturbation Theory in Quantum Mechanics Kenji Suzuki and Ryoji Okamoto Progress of Theoretical Physics Vol. 71 No. 6 (1984) pp. 1221-1238 General Structure of Effective Interaction in Degenerate Perturbation Theory Kenji Suzuki and Ryoji Okamoto Progress of Theoretical Physics Vol. 72 No. 3 (1984) pp. 534-548 Perturbation Theory for Quasidegenerate System in Quantum Mechanics Kenji Suzuki and Ryoji Okamoto Progress of Theoretical Physics Vol. 92 No. 6 (1994) pp. 1045-1080 Effective Interaction Theory and Unitary-Model-Operator Approach to Nuclear Saturation Problem Kenji Suzuki and Ryoji Okamoto Progress of Theoretical Physics Supplement No.95 (1988) pp. 46-77 Hyperfine Structure in Positronium Toshiyuki Murota
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Tosio Kato (1950) studied this question.
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