Mayer brackets and solvability of PDEs—I

@article{Kruglikov2002MayerBA,
  title={Mayer brackets and solvability of PDEs—I},
  author={Boris Kruglikov and Valentin V. Lychagin},
  journal={Differential Geometry and Its Applications},
  year={2002},
  volume={17},
  pages={251-272}
}
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