%0 Journal Article %A G. Stroth %T Chamber systems, geometries and parabolic systems whose diagram contains only bonds of strength 1 and 2. %J Inventiones mathematicae %D 1990 %P 209 %V 102 %N 2 %I mathdoc %U https://geodesic-test.mathdoc.fr/item/IM_1990__102_2_143834/ %G un %F IM_1990__102_2_143834