@phdthesis{Asche2001,
  author    = {Asche, Hartmut},
  title     = {Netzbasierte geographische Informationsverarbeitung},
  isbn      = {3-87907-353-8},
  year      = {2001},
  language  = {de}
}
@article{Asche2001,
  author    = {Asche, Hartmut},
  title     = {Kartographische Informationverarbeitung in Datennetzen-Prinzipien, Produkte, Perspektiven},
  isbn      = {3-87907-353-8},
  year      = {2001},
  language  = {de}
}
@article{Asche2001,
  author    = {Asche, Hartmut},
  title     = {Webbasierte Geoinformatik im BMBF-F{\"o}rderprogramm "Neue Medien in der Bildung"},
  isbn      = {3-87907-353-8},
  year      = {2001},
  language  = {de}
}
@article{AscheHermann2001,
  author    = {Asche, Hartmut and Hermann, Christian},
  title     = {Thematic cartography},
  isbn      = {0-7506-4996-8},
  year      = {2001},
  language  = {en}
}
@article{SiemerPfaffAsche2001,
  author    = {Siemer, Julia and Pfaff, A. and Asche, Hartmut},
  title     = {Geoinformationssysteme zur Bek{\"a}mpfung, Fr{\"u}hwarnung und Pr{\"a}vention von Naturgefahren},
  year      = {2001},
  language  = {de}
}