1. Armitage, P.: Statistical methods in medical research. Oxford-Edinburgh: Blackwell Scientific Publ. 1971
2. Bailey, R., Cushing, H., Eisenhardt, P.: Angioblastic meningiomas. Arch. Path.6, 953?990 (1928)
3. Courville, C. B.: Pathology of the central nervous system. 3rd ed. Mountain View, California: Pacific Press Publ. Assn. 1950
4. Crompton, M. R., Gautier-Smith, P. C.: The prediction of recurrence in meningiomas. J. Neurol. Psychiat.33, 80?87 (1970)
5. Cushing, H., Eisenhardt, L.: Meningiomas. Springfield, Ill.: Ch. C. Thomas 1938