Cubic root of Klein-Gordon equation

@article{Plyushchay2000CubicRO,
  title={Cubic root of Klein-Gordon equation},
  author={Mikhail S. Plyushchay and Michel Rausch de Traubenberg},
  journal={Physics Letters B},
  year={2000},
  volume={477},
  pages={276-284}
}

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