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Bao, H. and Thiemens, M. H. and Heine, Klaus (2001) Oxygen-17 excesses of the Central Namib gypcretes: spatial distribution. Earth and Planetary Science Letters 192, pp. 125-135.
Bao, H. and Thiemens, M. H. and Farquhar, J. and Campbell, D. A. and Chi-Woo Lee, Charles and Heine, Klaus and Loope, D. B. (2000) Anomalous 17O compositions in massive sulphate deposits on the Earth. Nature 406 (6792), pp. 176-178.