@article{BieligSchulzKuypersDormannsetal.1994,
  author    = {Bielig-Schulz, Gisela and Kuypers, Wilhelm and Dormanns, Klaus and Jahnke, Thomas and Lauter, Josef and Wuttke, Hans},
  title     = {Mathematik : 8. Schuljahr},
  publisher = {Cornelsen},
  address   = {Berlin},
  pages     = {272 S.},
  year      = {1994},
  language  = {de}
}
@article{LauterBoeltsJahnkeetal.1995,
  author    = {Lauter, Josef and B{\"o}lts, Gabriele and Jahnke, Thomas and Kuypers, Wilhelm and R{\"u}diger, Karlheinz and Wippermann, Christina and Wippermann, Heinrich and Wuttke, Hans},
  title     = {Mathematik Analysis : Gesamtband},
  publisher = {Cornelsen},
  address   = {Berlin},
  pages     = {304 S.},
  year      = {1995},
  language  = {de}
}