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On the theory of the WKB method. The case of a finite number of neighboring turning points. (English. Russian original) Zbl 0423.34080
Sov. Math., Dokl. 19, 986-990 (1978); translation from Dokl. Akad. Nauk SSSR 241, 1265-1268 (1978).
MSC:
34E20 Singular perturbations, turning point theory, WKB methods for ordinary differential equations
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