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Translated from Differentsial’nye Uravneniya, Vol. 40, No. 11, 2004, pp. 1468–1478. Original Russian Text Copyright © 2004 by Butenina, Starodubrovskaya.
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Butenina, N.N., Starodubrovskaya, N.S. A stable fixed focus and its immunity zone in a second-order controlled dynamical system. Diff Equat 40, 1545–1556 (2004). https://doi.org/10.1007/PL00021823
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DOI: https://doi.org/10.1007/PL00021823