@book{vonFrielingGuessefeldtKoopmann1993,
  author    = {Hans-Dieter von Frieling and J{\"o}rg G{\"u}ßefeldt and J{\"o}rg Koopmann},
  title     = {Digitale Karten in GIS},
  volume    = {11},
  year      = {1993},
}