@misc{Lankau2012,
  author    = {Ralf Lankau},
  title     = {Sudoku},
  url       = {http://bildung-wissen.eu/fachbeitraege/sudoku.html},
  institution = {Fakult{\"a}t Medien und Informationswesen (M+I) (bis 21.04.2021)},
  type      = {other},
  pages     = {1 -- 4},
  year      = {2012}
}