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024 _a31100
037 _cTextual
040 _aCSL
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041 _aeng
082 _aCN26:B114, K9
100 _aMigdal A B
245 0 _aApproximation methods in quantum mechanics
260 _c1969
300 _ap.
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650 _a Quantum mechanics
650 _aPhysics
700 _a Krainov V
942 _hCN26:B114, K9
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999 _c93690
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