%0 GKSS report %@ %A Ansmann, A., Riebesell, M., Wandinger, U., Weitkamp, C., Michaelis, W. %D 1991 %J Symposium on Lower Tropospheric Profiling: Needs and Technologies, a symposium to critically review and evaluate scientific needs and access current and projected technologies; extended abstracts %P 25-26 %T Klett forward-backward integration for model-independant determination of the aerosol extinction-to-backscatter ratio %U %X