The UDK and ISO 19115 Standard. - Oliver Karschnick; Fred A. Kruse; Stefanie Töpker; Thomas Riegel; Marco Eichler; Sven Behrens (EnviroInfo, 2003)

gein - Planning the Next Generation. - Fred A. Kruse; Oliver Karschnick; Stefanie Töpker; Thomas Riegel (EnviroInfo, 2003)