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Littlewood, J.E. 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. Acta Math. 98, 1–110 (1957). https://doi.org/10.1007/BF02404470
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DOI: https://doi.org/10.1007/BF02404470