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Moscow State University. Translated from Funktsional'nyi Analiz i Ego Prilozheniya, Vol. 17, No. 2, pp. 38–61, April–June, 1983.
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Kostyuchenko, A.G., Shkalikov, A.A. Self-adjoint quadratic operator pencils and elliptic problems. Funct Anal Its Appl 17, 109–128 (1983). https://doi.org/10.1007/BF01083136
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DOI: https://doi.org/10.1007/BF01083136