1. Herold, NA 2015. Topographic Maps from Open Data. TUWien, Austria: Universität Wien http://othes.univie.ac.at/36179/1/2015-02-04_0326453.pdf
2. The Open Source Initiative (OSI). N.d. “Welcome to The Open Source Initiative.” http://opensource.org/ . Accessed 23 October 2015.
3. Rojas, G, Giannopoulos, G, and Hladky, JJLD 2015. “Managing Geospatial Linked Data in the GeoKnow Project.” T. Narock and P. Fox (eds.). The Semantic Web in Earth and Space Science. Current Status and Future Directions, 20, 51.