%0 Journal Article %A M. E. Plis %T An ordinary differential equation homeomorphic with an essential control system %J Annales Polonici Mathematici %D 1971 %P 249-263 %V 25 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/ap-25-3-249-263/ %R 10.4064/ap-25-3-249-263 %G en %F 10_4064_ap_25_3_249_263