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- W2020006873 abstract "In this paper, we study the existence of periodic solutions of the equation x′(t) = −ƒ(x(t), x(t − τ)), where gt > 0, ƒ(x, y) is continuous on R2. We obtain a sufficient condition in which (1) has at least k non-constant oscillatory periodic solutions." @default.
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- W2020006873 title "The existence of periodic solutions of the equation x′(t) = −ƒ(x(t), x(t − τ))" @default.
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- W2020006873 doi "https://doi.org/10.1016/0022-247x(92)90290-t" @default.
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