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Deceased.
Leningrad. Translated from Sibirskii Matematicheskii Zhurnal, Vol. 30, No. 4, pp. 44–52, July–August, 1989.
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Deich, V.G. Generalization of the frequency theorem in the case of an unbounded observation operator and its application to absolute stability problems. Sib Math J 30, 535–542 (1989). https://doi.org/10.1007/BF00971752
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DOI: https://doi.org/10.1007/BF00971752