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Translated from Ukrainskii Matematicheskii Zhurnal, Vol. 41, No. 12, pp.1613–1618, December, 1989.
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Baskakov, A.G., Yurgelas, V.V. Indefinite dissipativity and invertibility of linear differential operators. Ukr Math J 41, 1385–1389 (1989). https://doi.org/10.1007/BF01056104
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DOI: https://doi.org/10.1007/BF01056104