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Deceased.
Translated from Ukrainskii Matematicheskii Zhurnal, Vol. 41, No. 11, pp. 1566–1568, November, 1989.
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Kuzenkov, O.A., Plotnikov, V.I. A certain property of a system of eigenfunctions on the boundary of the domain and its applications. Ukr Math J 41, 1352–1354 (1989). https://doi.org/10.1007/BF01056509
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DOI: https://doi.org/10.1007/BF01056509