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- [8] Georeferencing maps with contours 7TH WORLD MULTICONFERENCE ON SYSTEMICS, CYBERNETICS AND INFORMATICS, VOL X, PROCEEDINGS: SIGNALS PROCESSING AND OPTICAL SYSTEMS, TECHNOLOGIES AND APPLICATIONS, 2003, : 11 - 16
- [10] TOPOGRAPHICAL AND GEOLOGICAL MAPS OF SWITZERLAND ANNALES DE GEOGRAPHIE, 1958, 67 (360): : 184 - 185