%0 Journal Article %A Olach, Rudolf %T Oscillation of first order linear retarded equations %J Mathematica slovaca %D 2001 %P 547-557 %V 51 %N 5 %I mathdoc %U http://geodesic.mathdoc.fr/item/MASLO_2001__51_5_a4/ %G en %F MASLO_2001__51_5_a4