%0 Journal Article %A Ronald A. Knight %T Structure of certain closed flows %J Annales Polonici Mathematici %D 1983 %P 247-254 %V 41 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/ap-41-3-247-254/ %R 10.4064/ap-41-3-247-254 %G en %F 10_4064_ap_41_3_247_254