@article{Barmpalias2010RelativeRandomnessCardinality,
  year      = 2010,
  publisher = {Duke Univ. Press},
  volume    = {51},
  number    = {2},
  pages     = {195--205},
  author    = {G. Barmpalias},
  title     = {Relative Randomness and Cardinality},
  journal   = {Notre Dame J. Form. Log.},
}