%0 Journal Article %A Henryk Żołądek %T On first integrals for polynomial differential equations on the line %J Studia Mathematica %D 1993 %P 205-211 %V 107 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/sm-107-2-205-211/ %R 10.4064/sm-107-2-205-211 %G en %F 10_4064_sm_107_2_205_211