1. Polvani, L. M., Previdi, M. & Deser, C. Geophys. Res. Lett. 10.1029/2011GL046712 (2011).
2. McLandress, C. et al. J. Clim. 10.1175/2010JCLI3958.1 (2011).
3. Thompson, D. W. J. & Solomon, S. Science 296, 895–899 (2002).
4. Polvani, L. M., Waugh, D. W., Correa, G. J. P. & Son, S.-W. J. Clim. 10.1175/2010JCLI3772.1 (2011).
5. United Nations Environment Programme UNEP Year Book 2010 Ch. 4, 33–42 (UNEP, 2010); available via
http://go.nature.com/7ZERh7
.