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1957 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
J. E. Littlewood
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Acta Math. 98: 1-110 (1957). DOI: 10.1007/BF02404470
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Vol.98 • 1957
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