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Additional information
Institute for Chemical Physics, Academy of Sciences, USSR. Translated from Funktsional'nyi Analiz i Ego Prilozheniya, Vol. 8, No. 1, pp. 1–10, January–March, 1974.
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Virozub, A.I., Matsaev, V.I. The spectral properties of a certain class of self-adjoint operator functions. Funct Anal Its Appl 8, 1–9 (1974). https://doi.org/10.1007/BF02028300
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DOI: https://doi.org/10.1007/BF02028300