@article{Barmpalias2004ApproximationRepresentationsFor,
  year      = 2004,
  publisher = {Wiley-Blackwell},
  volume    = {50},
  number    = {45},
  pages     = {370--380},
  author    = {G. Barmpalias},
  title     = {Approximation representations for reals and their wtt-degrees},
  journal   = {{MLQ}},
}