1. Uo, K., et al., Proc. 9th Int. Conf. Plasma Phys. and Contr. Nucl. Fus., Baltimore, 1982, Vol. II, p. 209
2. W VII-A Team et al., Plasma Physics and Controlled Fusion, 26, 1A (1984) 183
3. Wilhelm, R., Janzen, G., M�ller, G., Sch�ller, P. G., Schw�rer, K., Thumm, M., Erckmann, V., Plasma Physics and Controlled Fusion, 26, 1A (1984) 259
4. Information by gyrotron producers: Varian Associates and Hughes Company
5. Janzen, G., M�ller, G., Sch�ller, P. G., Thumm, M., Wilhelm, R., Erckmann, V., 8th Int. Conf. Infrared and Millimeter Waves, IEEE, Miami Beach, Dec. 1983