@article{HerzigBreetzKaemmeretal.1997,
  author    = {Herzig, Reinhard and Breetz, Egon and K{\"a}mmer, H.-J. and Plapper, W.},
  title     = {Darstellungsmethoden in thematischen Karten : ein Leitfaden f{\"u}r die Hand des Lehrers},
  publisher = {Cornelsen},
  address   = {Berlin},
  pages     = {8 S.},
  year      = {1997},
  language  = {de}
}