Measurements of polar vortex air in the midlatitudes
Newman, P., L. R. Lait, M. R. Schoeberl, M. Seablom, L. Coy, R. Rood, R. Swinbank, M. Proffitt, M. Loewenstein, J. Podolske, J. W. Elkins, C. R. Webster, R. May, D. Fahey, G. Dutton, and R. Chan (1996), Measurements of polar vortex air in the midlatitudes, J. Geophys. Res., 101, 12,879-12.