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Bhatnagar, Jagdish P., Josef Novotny, Ajay Niranjan, Douglas Kondziolka1, John Flickinger, Dade Lunsford, ja M. Saiful Huq. First Year Experience With Newly Developed Leksell Gamma Knife(®) Perfexion(™). Medknow Publications, 2009.

Bhatnagar, Jagdish P., et al. First Year Experience With Newly Developed Leksell Gamma Knife(®) Perfexion(™). Medknow Publications, 2009.