@article{DBLP:journals/jsyml/Hodes80,
  author    = {Harold T. Hodes},
  title     = {Jumping Through the Transfinite: The Master Code Hierarchy
               of Turing Degrees},
  journal   = {J. Symb. Log.},
  volume    = {45},
  number    = {2},
  year      = {1980},
  pages     = {204-220},
  bibsource = {DBLP, http://dblp.uni-trier.de}
}