@misc{ansmann_klett_forwardbackward_1991, 
author={Ansmann, A., Riebesell, M., Wandinger, U., Weitkamp, C., Michaelis, W.},
title={Klett forward-backward integration for model-independant determination of the aerosol extinction-to-backscatter ratio},
year={1991},
howpublished = {GKSS report},
note = {Ansmann, A.; Riebesell, M.; Wandinger, U.; Weitkamp, C.; Michaelis, W.: Klett forward-backward integration for model-independant determination of the aerosol extinction-to-backscatter ratio. In: National Center for Atmospheric Research (Ed.): 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. Boulder, CO (USA). 1991. 25-26.}}