@book{ 0-1094352764, title = {Grundlagen der Geo-Informationssysteme}, author = {Bill, Ralf and Fritsch, Dieter}, address = {Karlsruhe}, publisher = {Wichmann}, year = {1991}, isbn = {3879072272}, language = {German}, url = {https://katalog.ub.tu-freiberg.de/Record/0-1094352764} }