1. J. Nuckolls, L. Wood, A. Thiessen, G. Zimmerman, Nature 239, 139 (1972)
2. G. Charatis, J. Downard, R. Goforth, B. Guscat, T. Henderson, S. Hildum, R. Johnson, K. Moncur, T. Leonard, F. Mayer, S. Segall, L. Siebert, D. Solomon and C. Thomas.- Proceedings 5th IAEA — Plasma Fusion Conference, Tokyo, Japan (1974)
3. E.K. Storm, H.G. Ahlstrom, M.J. Boyle, D.W. Phillion, V.C. Rupert, K.G. Tirsell, D.R. Speck, F. Rainer, L.W. Coleman, R.A. Lerche, H.N. Kornblum, LLL UCRL 78 581 (1976)
4. N.G. Basov, E.G. Gamaly, O.N. Krokhin, Yu. A. Mikhailov, G.V. Sklizkov, S.I. Fedotov, Third Workshop on “Laser Interaction and Related Plasma Phenomena”, Ed. by H. Schwarz and H. Hora, Plenum Press, Vol. 3B, 553 (1974)
5. T.F. Stratton, G.F. Erickson, C.A. Fenstermaker and E.O. Swickard, I.E.E.E. J. Quantum Electron. QE-9, 157 (1973)