First spaceborne observations of Antarctic stratospheric ClONO₂ recovery: Austral spring 2002 - Höpfner, M.; Clarmann, T. von; Fischer, H.; Glatthor, N.; Grabowski, U.; Kellmann, S.; Kiefer, M.; Linden, A.; Mengistu Tsidu, G.; Milz, M.; Steck, T.; Stiller, G. P.; et al. (Journal of Geophysical Research, 2004)