@article{Barmpalias2013AnaloguesChaitinS,
  author  = {G. B. Barmpalias and R. Holzl and A. E. M. Lewis and W. Merkle},
  journal = {Inf. Process. Lett.},
  pages   = {171--178},
  title   = {Analogues of Chaitin's Omega in the computably enumerable sets},
  volume  = {113},
  year    = {2013},
  issue   = {5-6},
}