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Translated from Sibirskii Matematicheskii Zhurnal, Vol. 16, No. 3, pp. 572–587, May–June, 1975.
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Orazov, M.B., Radzievskii, G.V. Basis and completeness theorems for the characteristic vectors of hyperbolic operator-functions. Sib Math J 16, 440–452 (1975). https://doi.org/10.1007/BF00967535
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DOI: https://doi.org/10.1007/BF00967535