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Translated from Ukrainskii Matematicheskii Zhurnal, Vol. 39, No. 6, pp. 717–721, November–December, 1987.
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Ivanov, A.F., Kusano, T. Oscillations of solutions of a class of functional-differential equations. Ukr Math J 39, 582–585 (1987). https://doi.org/10.1007/BF01062881
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DOI: https://doi.org/10.1007/BF01062881