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- Bill, R., 1999. Grundlagen der Geoinformationssysteme - Band 1 4th. Wichmann Verlag.
- Jones, C., 1997. Geographical Information Systems and Computer Cartography. Prentice-Hall.
- Nievergelt, J., 1984. The Grid file: an adaptable symmetric multi-key file structure. Berlin/Heidelberg: Springer.