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Perturbation theory for a polyharmonic operator with nonsmooth periodic potential. (English. Russian original) Zbl 0724.47022

J. Sov. Math. 54, No. 3, 911-915 (1991); translation from Zap. Nauchn. Semin. Leningr. Otd. Mat. Inst. Steklova 169, 76-83 (1988).
MSC:  47F05 47A10 47A55
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