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Additional information
Odessa. Translated from Sibirskii Mathematicheskii Zhurnal, Vol. 32, No. 5, pp. 112–125, September–October, 1991.
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Nudel'man, M.A. A singular case of the problem of absolute stability of systems with lag (and scalar control). Sib Math J 32, 822–834 (1991). https://doi.org/10.1007/BF00971180
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DOI: https://doi.org/10.1007/BF00971180