@mastersthesis{unruh03zufallsextraktoren,
  author       = {Unruh, Dominique},
  title        = {Zufallsextraktoren f\"{u}r Quellen variierender Qualit\"{a}t},
  school       = {Institut f\"{u}r Algorithmen und Kognitive Systeme, University of Karlsruhe},
  month        = {July},
  year         = {2003},
  note         = {In German}
}