@article{Shiltsev:2016FH,
  author = "Shiltsev, Vladimir",
  title = "{Crystal Ball : On the Future High Energy Colliders}",
  doi = "10.22323/1.234.0515",
  journal = "PoS",
  year = 2016,
  volume = "EPS-HEP2015",
  pages = "515"
}