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• BBC News: Particle physics on the cancer ward - Mar. 6, 2007
• The National Association for Proton Therapy
• Optivus: What is Proton Beam Therapy?

• Jones, Bleddyn. "Particle physics on the cancer ward." BBC News. Mar. 6, 2007.
  http://news.bbc.co.uk/2/hi/health/6403737.stm
• The National Association for Proton Therapy
  http://www.proton-therapy.org/
• "Principles of Proton Beam Therapy." Massachusetts General Hospital Cancer Center.
  http://www.massgeneral.org/cancer/about/providers /radiation/proton/principles.asp
• "Radiation Therapy: New Rays Of Hope." BusinessWeek Online. February 12, 2007.
  http://www.businessweek.com/magazine/content/07_07/b4021079.htm?
  chan=technology_technology+index+page_best+of+the+magazine
• "What is Proton Beam Therapy?" Optivus. http://www.optivus.com/whatispt.htm