NASA - National Aeronautics and Space Administration

Wilson, J., M. R. Stolzenburg, W. E. Clark, M. Loewenstein, G. V. Ferry, R. Chan, and K. Kelly (1992), Stratospheric sulfate aerosol in and near the northern hemisphere polar vortex: The morphology of the sulfate layer, multimodal size distribution and the effect of denitrification, J. Geophys, Res., 97, 7997-8013.