%0 Journal Article %A Ronald Knight %T Prolongationally stable discrete flows %J Fundamenta Mathematicae %D 1980 %P 137-144 %V 108 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/fm-108-2-137-144/ %R 10.4064/fm-108-2-137-144 %G en %F 10_4064_fm_108_2_137_144