@misc{Barrettlandscape,
  title = "{The computational landscape of general physical theories}",
  author = "Barrett, J. and de Beaudrap, N. and Hoban, M. J. and Lee, C. M.",
  year = "2017",
  month = "feb",
  pages = "1--15",
  url = "http://arxiv.org/abs/1702.08483",
}