@misc{bellini2014maximal,
  title={Maximal freedom at minimum cost: linear large-scale structure in general modifications of gravity},
  author={Emilio Bellini and Ignacy Sawicki},
  year={2014},
  eprint={1404.3713},
  archivePrefix={arXiv},
  primaryClass={astro-ph.CO},
  url={https://arxiv.org/abs/1404.3713}
}