Polar Stratospheric Cloud Processed Air and Potential Vorticity in the Northern...

Tuck, A. F., T. Davies, S. J. Hovde, M. Noguer-Alba, D. Fahey, S. R. Kawa, K. Kelly, D. Murphy, M. Proffitt, J. Margitan, M. Loewenstein, J. Podolske, S. Strahan, and R. Chan (1992), Polar Stratospheric Cloud Processed Air and Potential Vorticity in the Northern Hemisphere Lower Stratosphere at Mid-Latitudes During Winter, J. Geophys. Res., 97, 7883-7904.