Iterative differential equations and the Abhyankar conjecture

@article{Matzat2003IterativeDE,
  title={Iterative differential equations and the Abhyankar conjecture},
  author={B. Heinrich Matzat and Marius van der Put},
  journal={Crelle's Journal},
  year={2003},
  volume={557},
  pages={1-52}
}
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