Schoeberl, M. R., L. R. Lait, P. Newman, R. L. Martin, M. Proffitt, D. L. Hartmann, M. Loewenstein, J. Poldoske, S. Strahan, J. Anderson, R. Chan, and B. Gary (1989), Reconstruction of the Constituent Distribution and Trends in the Antarctic Polar Vortex from the ER-2 Flight Observation, J. Geophys. Res., 94, 16,815-16.