MathSciNet bibliographic data MR549582 34K15 Nussbaum, Roger D. Uniqueness and nonuniqueness for periodic solutions of $x\sp{\prime} (t)=-g(x(t-1))$$x\sp{\prime} (t)=-g(x(t-1))$. J. Differential Equations 34 (1979), no. 1, 25–54. Article

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