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Lehmann, B.E.; Loosli, H.H.; Rauber, D.; Thonnard, N.; Willis, R.D. (1991). 81Kr and 85Kr in groundwater, milk river aquifer, Alberta, Canada. Applied geochemistry, 6(4), pp. 419-423. Pergamon 10.1016/0883-2927(91)90041-M
Lehmann, B.E.; Rauber, D.F.; Thonnard, N.; Willis, R.D. (1987). An isotope separator for small noble gas samples. Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, 28(4), pp. 571-574. Elsevier 10.1016/0168-583X(87)90505-2
Thonnard, N.; Willis, R.D.; Wright, M.C.; Davis, W.A.; Lehmann, B.E. (1987). Resonance ionization spectroscopy and the detection of 81Kr. Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, 29(1-2), pp. 398-406. Elsevier 10.1016/0168-583X(87)90273-4
Kramer, S.D.; Hurst, G.S.; Chen, C.H.; Payne, M.G.; Allman, S.L.; Phillips, R.C.; Lehmann, B.E.; Oeschger, H.; Loosli, H.H.; Willis, R.D.; Thonnard, N. (1986). Analysis of 81Kr groundwater using laser resonance ionization spectroscopy. Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, 17(5-6), pp. 395-401. Elsevier 10.1016/0168-583X(86)90171-0
Lehmann, B. E.; Oeschger, H.; Loosli, H. H.; Hurst, G. S.; Allman, S. L.; Chen, C. H.; Kramer, S. D.; Payne, M. G.; Phillips, R. C.; Willis, R. D.; Thonnard, N. (1985). Counting 81Kr atoms for analysis of groundwater. Journal of Geophysical Research: Solid Earth, 90(B13), pp. 11547-11551. American Geophysical Union 10.1029/JB090iB13p11547
Willis, R. D.; Thonnard, N.; Wright, M. C.; Lehmann, B. E.; Rauber, D. (1988). Counting 81Kr atoms in groundwater using a resonance ionization spectroscopy time of flight system. In: Fourth International Symposium on Resonance Ionization Spectroscopy and Its Applications. Institute of Physics Conference Series: Vol. 94 (p. 213). Institute of Physics
Thonnard, N.; Willis, R.; Wright, M.; Davis, W.; Lehmann, B. (1987). Noble gas atom counting using RIS and TOF mass spectrometry II: First results. Institute of Physics conference series, 84(Section 2), p. 9186. Bristol: Institute of Physics
Lehmann, B.; Rauber, D.; Thonnard, N.; Willis, R. (1987). The challenge of sorting out 1000 atoms of krypton-81 from 1025 molecules of water. Institute of Physics conference series, 84. Bristol: Institute of Physics
