Browell, E., C.F. Butler, M.A. Fenn, W.B. Grant, S. Ismail, M.R. Schoeberl, O.B. Toon, M. Loewenstein, and J.R. Podolske (1993), Ozone and aerosol changes observed during the 1991-92 Airborne Arctic Stratospheric Expedition, Science, 261, 1155-1158.