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The research was supported by the Russian Foundation for Basic Research (Grant 97-01-00894).
Novosibirsk. Translated fromSibirskiî Matematicheskiî Zhurnal, Vol. 39, No. 2, pp. 409–426, March–April, 1998.
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Pyatkov, S.G. Indefinite elliptic spectral problems. Sib Math J 39, 358–372 (1998). https://doi.org/10.1007/BF02677520
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DOI: https://doi.org/10.1007/BF02677520