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Perturbation of solutions and perturbation of eigenvalues and eigenfunctions of second-order elliptic equations when there is perturbation of the boundary. (English. Russian original) Zbl 0171.08402
Sov. Math., Dokl. 5, 1018-1022 (1964); translation from Dokl. Akad. Nauk SSSR 157, 784-787 (1964).

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