1. The Open Source Definition (Annotated)http://opensource.org/docs/definition.html
2. 94 Percent of the World's Top 500 Supercomputers Run Linuxhttps://www.linux.com/news/enterprise/high-performance/147-high-performance/666669-94-percent-of-the-worlds-top-500-supercomputers-run-linux
3. 75% of Top 10k Websites Served by Open Source Softwarehttp://royal.pingdom.com/2012/05/22/75-percent-top-10k-websites-served-by-open-source-software/
4. Survey: 98 Percent of Enterprises Using Open Source Software, Interrupted—CNET Newshttp://news.cnet.com/8301-13846_3-20013258-62.html
5. Open source physics;Christian;Science,2011