@article{Reibis1996,
  author    = {Reibis, Eugen},
  title     = {Entwicklung grundlegenden Wissens im Lehrbereich Kreis : Kopiervorlagen},
  year      = {1996},
  language  = {de}
}
@article{JahnkeBruecknerReibisetal.1998,
  author    = {Jahnke, Thomas and Br{\"u}ckner, Axel and Reibis, Eugen and Schulz, Rosemarie},
  title     = {Prozente},
  year      = {1998},
  language  = {de}
}