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Schnell, R. C., S. C. Liu, S. J. Oltmans, R. S. Stone, D. J. Hofmann, E. G. Dutton, T. Deshler, W. T. Sturges, J. W. Harder, S. D. Sewell, M. Trainer, and J. M. Harris. 1991. Decrease of summer tropospheric ozone concentrations in Antarctica. Nature 351: 726-29.

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