%0 Journal Article %A J. Lewowicz %T Applications of elementary topological methods to existence problems for bounded solutions of systems of ordinary differential equations %J Annales Polonici Mathematici %D 1964 %P 305-308 %V 15 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/ap-15-3-305-308/ %R 10.4064/ap-15-3-305-308 %G en %F 10_4064_ap_15_3_305_308