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Amstutz, Christoph A; Bechrakis, Nikolaos E; Foerster, Michael H; Heufelder, Jens; Kowal, Jens H (2012). Intraoperative localization of tantalum markers for proton beam radiation of choroidal melanoma by an opto-electronic navigation system: a novel technique. International journal of radiation oncology, biology, physics, 82(4), pp. 1361-6. New York, N.Y.: Elsevier 10.1016/j.ijrobp.2011.04.049
