Denitrification and mixing in the 1994/1995 arctic vortex derived from MIPAS-B: measurements and modelling - Oelhaf, H.; Wetzel, G.; Stowasser, M.; Raff, D.; Ruhnke, R.; Friedl-Vallon, F.; Maucher, G.; Seefeldner, M.; Trieschmann, O.; Clarmann, T. von; Fischer, H.; Peter, T. (1999)