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Translated from Sibirskii Matematicheskii Zhurnal, Vol. 14, No. 2, pp. 384–420, March–April, 1973.
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Yakubovich, V.A. A frequency theorem in control theory. Sib Math J 14, 265–289 (1973). https://doi.org/10.1007/BF00967952
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DOI: https://doi.org/10.1007/BF00967952