2Lunardi P,Licastro G, Missori P, et al.Management of intramedullary tumors in children. Acta Neurochir(wien), 1993,120:59.
3Mccormick PC, Torres R, Post KD.Intramedullary ependymoma of the spinal cond. Jneurosrg, 1990,72:523.
4McCormick PC. Anatomic principles of intradural spinal surgery. in A1bertL. Rhoton JR et al. Clinical Neurosurgery. Spizinger Press, 1994.205- 223.
5Epstein FJ,Farmer JP,Freed D.Adult intramedullary spinal cord ependymomas: the results of surgery in 38 patients. Neurosurgery, 1993,79:204.
6Cooper PrR. Outcome after operatve treatment of intramedullary spinal cord tumors in adults:intermediate and long-term results in 51patients. Neurosurg, 1989,25:855.