MathSciNet bibliographic data MR141837 34.45 Jones, G. Stephen The existence of periodic solutions of $f\sp{\prime} (x)=-\alpha f(x-1)\{1+f(x)\}$$f\sp{\prime} (x)=-\alpha f(x-1)\{1+f(x)\}$. J. Math. Anal. Appl. 5 1962 435–450. Article

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