1. A.H. Lettington, J.W. Steeds: Philos. Trans. R. Soc. London A342, 193 (1993)
2. J.E. Graebner, T.M. Hartnett, R.P. Miller: Appl. Phys. Lett.64, 2549 (1994)
3. P.K. Bachmann, U. Linz: Spektrum Wiss.9, 30 (1992)
4. D.G. Ott:Syntheses with Stable Isotopes of Carbon, Nitrogen and Oxygen, 1st edn. (Wiley-Interscience, New York 1981) p. 4
5. V.S. Letokhov: Appl. Phys. B46, 237 (1980)