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Publication:3812577
zbMath0663.34026MaRDI QIDQ3812577
Publication date: 1987
Full work available at URL: http://www.numdam.org/item?id=SB_1985-1986__28__103_0
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Perturbation theories for operators and differential equations in quantum theory (81Q15) Singular perturbations, turning point theory, WKB methods for ordinary differential equations (34E20) Variational problems in infinite-dimensional spaces (58E99) Ordinary differential operators (34L99) Dynamical systems and ergodic theory (37-XX)
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