Quantizing with a Higher Time Derivative

@article{Ketov2012QuantizingWA,
  title={Quantizing with a Higher Time Derivative},
  author={Sergei Ketov and Genta Michiaki and Tsukasa Yumibayashi},
  journal={arXiv: High Energy Physics - Theory},
  year={2012}
}
We review the classical and quantum theory of the Pais-Uhlenbeck oscillator as the toy-model for quantizing f(R) gravity theories. 
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