1. Bailey, P., andJ. D. Herrmann: Role of cells of Schwann in formation of tumors of peripheral nerves. Amer. J. Path.14, 1?38 (1938).
2. Chlopin, N. G.: On the cultivation of neurogenic tumors of man outside the organism. Acad. Sci. V.R.S.S. Compt. Rend.41, 132?134 (1943).
3. Costero, I., C. M. Pomerat, andR. Barroso-Moguel: Tumors of the human nervous system in tissue culture. II. An analysis of fibroblastic activity in meningiomas. J. nat. Cancer Inst.15, 1341?1365 (1955).
4. Cox, L. B., andM. L. Cranage: Studies on the tissue culture of intracranial tumors. J. Path. Bact.45, 477?499 (1937).
5. Cravioto, H.: The perineurium as a diffusion barrier. Ultrastructural correlates. Bull. Los Angeles neurol. Soc.31, 196?208 (1966).