MathSciDoc: An Archive for Mathematician ∫

@inproceedings{j.1957on,
  title={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},
  author={J. E. Littlewood},
  url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203147521484852},
  booktitle={Acta Mathematica},
  volume={98},
  number={1},
  pages={1-110},
  year={1957},
}