1. W.Drost, H.Moser, F.Neumaier, W.Rauert: Isotope Methods in Groundwater Hydrology, Commission of the European Communities Eurisotop, Office Information Booklet 61 (1974)
2. R.A.McClatchey, W.S.Benedict, S.A. Clough, D.E.Burch, R.E. Calfee, K.Fox, L.S.Rothman, J.S.Garing: AFCRL-TR-73-0096 (1973)
3. K.O. White, W.R. Watkins, C.W. Bruce, R.E. Meredith, F.G. Smith: Appl. Opt.17, 2711 (1978)
4. A. Tönnißen, J. Wanner, K.W. Rothe, H. Walther: Appl. Phys.18, 297 (1979)
5. L.-G. Rosengren: Appl. Opt.14, 1960 (1975)