@misc{donoghue2019unitarity,
  title={Unitarity, stability and loops of unstable ghosts},
  author={John F. Donoghue and Gabriel Menezes},
  year={2019},
  eprint={1908.02416},
  archivePrefix={arXiv},
  primaryClass={hep-th},
  doi={10.1103/PhysRevD.100.105006},
  url={https://arxiv.org/abs/1908.02416}
}