@misc{campiglia2014asymptotic,
  title={On asymptotic symmetries and subleading soft graviton theorem},
  author={Miguel Campiglia and Alok Laddha},
  year={2014},
  eprint={1408.2228},
  archivePrefix={arXiv},
  primaryClass={hep-th},
  url={https://arxiv.org/abs/1408.2228}
}