J. Flickinger/D. Kondziolka/A. Niranjan/D. Lunsford: Results of acoustic neuroma radiosurgery - an analysis of 5 years' experience using current methods. J. Neurosurgery 94 (2001), 1-6. G. Noren/D. Greitz/A. Hirsch/I. Lax: Gamman knife surgery in acoustic tumors. Acta Neurochir. Supp. 58 (1993), 104-107. D. Prasad/M. Steiner/L. Steiner: Gamma surgery for vestibular schwannoma. J. Neurosurgery 92 (2000), 745-759. R. Wiet/A. Micco/G. Bauer: Complications of the gamma knife. Arch. Otolar. Head Neck Surg. 122 (1996), 414-416.