@misc{valentino2021realm,
  title={In the Realm of the Hubble tension $-$ a Review of Solutions},
  author={Eleonora Di Valentino and Olga Mena and Supriya Pan and Luca Visinelli and Weiqiang Yang and Alessandro Melchiorri and David F. Mota and Adam G. Riess and Joseph Silk},
  year={2021},
  eprint={2103.01183},
  archivePrefix={arXiv},
  primaryClass={astro-ph.CO},
  url={https://arxiv.org/abs/2103.01183}
}