Salawitch, R.J., S. Wofsy, P. Wennberg, R.C. Cohen, J.G. Anderson, D.W. Fahey, R. Gao, E.R. Keim, E.L. Woodbridge, R.M. Stimpfle, J.P. Koplow, D.W. Kohn, C.R. Webster, R. May, L. Pfister, E.W. Gottlieb, H.A. Michelsen, G.K. Yue, J.C. Wilson, C.A. Brock, H.H. Jonsson, J.E. Dye, D. Baumgardner, . Proffitt, M. Loewenstein, J.R. Podolske, J.W. Elkins, G.S. Dutton, E.J. Hintsa, A. Dessler, E. Weinstock, K. Kelly, K.A. Boering, B.C. Daube, . 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.