@article{Barmpalias2007AlgorithmicRandomnessClosed,
  year      = 2007,
  publisher = {Oxford Univ. Press},
  volume    = {17},
  number    = {6},
  pages     = {1041--1062},
  author    = {G. Barmpalias and P. Brodhead and D. Cenzer and S. Dashti and R. Weber},
  title     = {Algorithmic Randomness of Closed Sets },
  journal   = {J. Log. Comput.},
}