1. 〈http://www.scientificamerican.com/article.cfm?id=tevatron-shutdown-at-fermillab〉.
2. The URL of ATLAS Collaboration 〈http://atlas.web.cern.ch/Atlas/Collaboration/〉.
3. The URL of the CMS Collaboration 〈http://cms.cern.ch/〉.
4. The URL of LHCb Collaboration 〈http://lhcb.web.cern.ch/lhcb/〉.
5. The URL of ALICE Collaboration 〈http://aliceinfo.cern.ch/Public/Welcome.html〉.