On the algebra of nonlocal symmetries for the 4D Martínez Alonso–Shabat equation

@article{Krasilshchik2020OnTA,
  title={On the algebra of nonlocal symmetries for the 4D Mart{\'i}nez Alonso–Shabat equation},
  author={Iosif Krasil’shchik and Petr Vojcak},
  journal={arXiv: Exactly Solvable and Integrable Systems},
  year={2020}
}
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This article has been accepted for publication in International Mathematics Research Notices Published by Oxford University Press.