Salawitch, R., S. C. Wofsy, P. Wennberg, R. C. Cohen, J. Anderson, D. Fahey, R. Gao, E. R. Keim, E. L. Woodbridge, R. Stimpfle, J. P. Koplow, D. W. Kohn, C. R. Webster, R. May, L. Pfister, E. Gottlieb, H. A. Michelsen, G. K. Yue, J. Wilson, C. Brock, H. Jonsson, J. E. Dye, D. Baumgardner, M. Proffitt, M. Loewenstein, J. Podolske, J. W. Elkins, G. Dutton, E. Hintsa, A. Dessler, E. Weinstock, K. Kelly, K. A. Boering, B. Daube, R. Chan, and S. W. Bowen (1994), The Distribution of Hydrogen, Nitrogen, and Chlorine Radicals in the Lower Stratosphere: Implications for Changes in O3 Due to Emission of NOy from Supersonic Aircraft, Geophys. Res. Lett., 21, 2547-2550.