@article{Barmpalias20020ComputableReals,
  year      = 2002,
  publisher = {Elsevier},
  volume    = {66},
  number    = {1},
  pages     = {1--12},
  author    = {G. Barmpalias},
  title     = {On 0$\prime$-computable reals},
  journal   = {Electron. Notes Theor. Comput. Sci.},
}