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Complete integrability and perturbation of a nonlinear Dirichlet problem. I. (English) Zbl 0425.35090

MSC:
35R20 Operator partial differential equations (= PDEs on finite-dimensional spaces for abstract space valued functions)
35B20 Perturbations in context of PDEs
47F05 General theory of partial differential operators (should also be assigned at least one other classification number in Section 47-XX)
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