@incollection{Barmpalias2007WorkingLrDegrees,
  publisher = {Springer},
  pages     = {89--99},
  author    = {G. Barmpalias and A. E. M. Lewis and M. Soskova},
  title     = {Working with the {LR} Degrees},
  booktitle = {Lect. Notes Comput. Sci.},
  year      = {2007},
}