On the criteria for integrability of the Liénard equation

@article{Kudryashov2016OnTC,
  title={On the criteria for integrability of the Li{\'e}nard equation},
  author={Nikolai A. Kudryashov and Dmitry I. Sinelshchikov},
  journal={Appl. Math. Lett.},
  year={2016},
  volume={57},
  pages={114-120}
}
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TLDR
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