1. http://en.wikipedia.org/wiki/Eratosthenes
2. http://www.eureka.be/inaction/AcShowProjectOutline.do
3. City of Helsinki converts to 3D Mapping:
http://www.bentley.com/en-US/Markets/Geospatial/User+Stories/3D+Mapping.htm
4. Tao, Vincent, Jonathan Li (Eds.): Advances in Mobile Mapping Technology. Taylor&Francis, London, 2007
5. T’Siobbel, Stephen: Mobile Digital Mapping: Field data collection Matters!. Proceedings ITS World 2004, Nagoya 2004