1. Production, review, and impact of technical quality control guidelines in a national context;Nielsen;J Appl Clin Med Phys,2016
2. Canadian partnership for quality radiotherapy. Technical quality control guidelines for safety systems at radiation treatment centres 2016 http://www.cpqr.ca/programs/technical-quality-control
3. Gamma Knife (GK) Perfexion™, Elekta AB 2015 http://www.elekta.com/
4. Leksell Gamma Knife Perfexion™ Instruction for Use, Elekta AB 2007 https://www.elekta.com/
5. A protocol for the determination of absorbed dose from high-energy photon and electron beams;Task Group 21, Radiation Therapy Committee, AAPM;Med Phys,1983