1. Alwasiak, J., Hajdukiewicz, G., Karasek, M., Papierz, W.: Scanning electron microscopy of tissue cultures of gliomas. Ann. Med. Sect. Pol. Acad. Sci.19, 87?88 (1974)
2. Ambrose, E. J., Batzdorf, U., Easty, M.: Morphology of astrocytomas in tissue culture: Optical and stereoscan microscopy. J. Neuropathol. Exp. Neurol.31, 596?610 (1972)
3. Conley, F. K., Rubinstein, L. J., Spence, A. M.: Studies in experimental malignant nerve sheath tumors maintained in tissue and organ culture systems. II. Electron microscopic observations. Acta Neuropathol. (Berl.)34, 293?310 (1976)
4. Cravioto, H., Palekar, L., Weiss, E., Bennett, K.: Experimental neurinoma in tissue culture. Acta Neuropathol. (Berl.)21, 154?164 (1972)
5. Druckrey, H., Ivankovic, S., Preussmann, R., Zülch, K. J., Mennel, H. D.: Selective induction of malignant tumours of the nervous system by resorptive carcinogens. In: The experimental biology of brain tumors, (ed.) W. Kirsch, P. Paoletti, E. Grossi-Paoletti, pp. 85?147. Springfield: Thomas 1972