1. Topics Appl. Phys.,1979
2. V.S. Letokhov, C.B. Moore: InChemical and Biochemical Applications of Lasers, Vol. 3, ed. by C.B. Moore (Academic Press, New York 1977)
3. R.L.Farrar, D.F.Smith: AEC Oak Ridge Report K-L-3054 (March 1972)
4. M.Boring, J.W.Mosckowitz: Chem. Phys. Lett.38, 185 (1976)
5. D.H.Maylotte, R.L.St.Peters, R.P.Messmer: Chem Phys. Lett.38, 181 (1976)