The partitioning of reactive nitrogen species (NOy) in the stratosphere during the arctic winter 1998/99 - Bausch, S.; Grooß, J.-U.; Steinhorst, H.; Konopka, Paul; Oelhaf, H.; Stowasser, M.; Friedl-Vallon, F.; Lefevre, F.; Müller, F. (Soc., 2003)