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On non-linear differential equations of the second order: III. The equation $$\ddot y - k(1 - y^2 )\dot y + y = b \mu k cos (\mu t + \alpha )$$ for largek, and its generalizationsfor largek, and its generalizations[J] . J. E. Littlewood.Acta Mathematica . 1957 (1)
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On non-linear differential equations of the second order: IV. The general equation $$\ddot y + kf\left( y \right)\dot y + g\left( y \right) = bkp\left( \varphi \right)$$ , φ=t+α, φ=t+α[J] . J. E. Littlewood.Acta Mathematica . 1957 (1)