@article{Barmpalias2012UniversalityProbabilityPrefix,
  year      = 2012,
  publisher = {R. Soc.},
  volume    = {370},
  number    = {1971},
  pages     = {3488--3511},
  author    = {G. Barmpalias and D. L. Dowe},
  title     = {Universality probability of a prefix-free machine},
  journal   = {Philos. Trans. R. Soc. A},
}