Mueller, S. C., N. Kaempfer, D. G. Feist, A. Haefele, M. Milz, N. Sitnikov, C. Schiller, C. Kiemle, and J. Urban (2008), Validation of stratospheric water vapour measurements from the airborne microwave radiometer AMSOS, ATMOSPHERIC CHEMISTRY AND PHYSICS, 8(12), 3169-3183, doi:10.5194/acp-8-3169-2008.