@article{Barmpalias2007RandomnessLinearDegrees,
  year      = 2007,
  publisher = {Elsevier},
  volume    = {145},
  number    = {3},
  pages     = {252--257},
  author    = {A. E. M. Lewis and G. Barmpalias},
  title     = {Randomness and the linear degrees of computability},
  journal   = {Ann. Pure Appl. Logic},
}