Hartmann, G. K., Bevilacqua, R. M., Schwartz, P. R., Kämpfer, N., Künzi, K. F., Aellig, C. P., et al. (1996). Measurements of O3, H2O and ClO in the middle atmosphere using the Millimeter-Wave Atmospheric Sounder (MAS). Geophysical Research Letters, 23, 2313-2316.