The variability of ClONO₂ and HNO₃ in the arctic polar vortex: comparison of Transall Michelson interferometer for passive atmospheric sounding measurements and three-dimensional model results - Chipperfield, M. P.; Pyle, J. A.; Blom, C. E.; Glatthor, N.; Höpfner, M.; Gulde, T.; Piesch, C.; Simon, P. (1999)