Narra, S., Bens, O., Raab, T., Hüttl, R. F. J. (2008): Structural amelioration of virgin clay soils in Lusatia with flue gas desulphurization gypsum, (Geophysical Research Abstracts; Vol. 10, EGU2008-A-00021), General Assembly European Geosciences Union (Vienna, Austria 2008).