References
Christl, A. (2008). “Free software and open-source business models”, in Hall, G. Brent and Michael G. Leahy,
(eds.) Open-source approaches to spatial data handling, Springer, Berlin, 21– 48.
DoD (2009). Clarifying Guidance Regarding Open Source Software (OSS). http:cio-nii.defense.gov/sites/
oss/2009OSS.pdf or http://wiki.osgeo.org/wiki/Case_Studies#US_Department_of_Defense, last accessed
on 14 Jan. 2010.
Hall, G. B. and M. G. Leahy (2008). Open-source approaches to spatial data handling, Springer, Berlin.
Perens, B. (2005). The Emerging Economic Paradigm of Open Source. http://perens.com/Articles/Economic.
html, last accessed on 14 Jan. 2010.
2.3. Open-Source Software for Geospatial Data –
The Birth of OSGeo
Arnulf
Christl
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