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Translated from Matematicheskii Zhurnal, Vol. 25, No. 1, pp. 129–134, January–February, 1973.
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Samoilenko, A.M., Perestyuk, N.A. Invariant sets of systems with instantaneous changes in standard form. Ukr Math J 25, 111–115 (1973). https://doi.org/10.1007/BF01085404
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DOI: https://doi.org/10.1007/BF01085404