@article{SchneiderGreinerSoff2006,
  author    = {Stefan Michael Schneider and Walter Greiner and Gerhard Soff},
  title     = {Vacuum-polarization contribution to the hyperfine-structure splitting of hydrogenlike atoms},
  journal   = {Physical review. A},
  volume    = {50},
  number    = {1},
  pages     = {118 -- 122},
  year      = {2006},
}