@article{Salmi_2011, title={Mesosphere-to-stratosphere descent of odd nitrogen in February–March 2009 after sudden stratospheric warming}, volume={11}, ISSN={1680-7324}, url={http://dx.doi.org/10.5194/acp-11-4645-2011}, DOI={10.5194/acp-11-4645-2011}, number={10}, journal={Atmospheric Chemistry and Physics}, publisher={Copernicus GmbH}, author={Salmi, S.-M. and Verronen, P. T. and Thölix, L. and Kyrölä, E. and Backman, L. and Karpechko, A. Yu. and Seppälä, A.}, year={2011}, month=may, pages={4645–4655} }