1. J. J. Wynne, P. P. Sorokin: Optical mixing in atomic vapors, in Nonlinear Infrared Generation,ed. by Y.-R. Shen, Topics Appl. Phys., Vol. 16 (Springer, Berlin, Heidelberg 1977) pp. 159 — 214
2. C. R. Vidal: Appl. Opt. 19, 3897 (1980)
3. W. Jamroz, B. P. Stoicheff: Generation of tunable coherent vacuum-ultraviolet radiation, in Progress in Optics, 20, 326 - 380 ( North Holland, Amsterdam 1983 )
4. C. R. Vidal, P. Klopotek, H. Scheingraber: State-selective vacuum uv spectroscopy of small molecules, in Laser Techniques in the Extreme Ultraviolet, ed. by S. E. Harris and T. B. Lucatorto, AIP Conf. Proc. 119, 233 — 245 (1984)
5. C. R. Vidal: Advances in Vacuum Ultraviolet Spectroscopy, Laser 84, (STS Press, McLean, Va. 1985) p. 1