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1957On 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. E. Littlewood "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 Mathematica, Acta Math. 98(none), 1-110, (1957)