How soon can you decide whether Alice is permitted to communicate or share resources with Bob?

Bernard Butler, Brendan Jennings. How soon can you decide whether Alice is permitted to communicate or share resources with Bob?. TinyToCS, 2, 2013. [doi]

@article{ButlerJ13,
  title = {How soon can you decide whether Alice is permitted to communicate or share resources with Bob?},
  author = {Bernard Butler and Brendan Jennings},
  year = {2013},
  url = {http://tinytocs.org/vol2/papers/tinytocs2-butler.pdf},
  researchr = {https://researchr.org/publication/ButlerJ13},
  cites = {0},
  citedby = {0},
  journal = {TinyToCS},
  volume = {2},
}