1. Sakharov, A.D., Lyudaev, R.Z., Smirnov, E.N., Plyushchev, Yu.I., Pavlovskii, A.I., Chernyshev, V.K., Feoktistova, E.A., Zharinov, E.I., and Zysin, Yu.A., Dokl. Akad. Nauk SSSR, 1965, vol. 165, no. 1, pp. 65–68.
2. Fowler, C.M., Garn, W.B., and Caird, R.S., J. Appl. Phys., 1960, vol. 31, no. 3, pp. 588–594.
3. Pavlovskii, A.I., Kolokol’chikov, N.P., Dolotenko, M.I., and Bykov, A.I., Prib. Tekh. Eksp., 1979, no. 5, pp. 195–197.
4. Pavlovskii, A.I., Dolotenko, M.I., Kolokol’chikov, N.P., Bykov, A.I., Egorov, N.I., and Tatsenko, O.M., Pis’ma Zh. Tekh. Fiz., 1983, vol. 9, no. 22, pp. 1360–1364.
5. Pavlovskii, A.I., Dolotenko, M.I., Kolokol’chikov, N.P., Bykov, A.I., Egorov, N.I., and Tatsenko, O.M., Pis’ma Zh. Eksp. Teor. Fiz., 1983, vol. 38, no. 9, pp. 437–438.