%0 Journal Article %A Olach, Rudolf %A Šamajová, Helena %T Oscillatory properties of nonlinear differential systems with retarded arguments %J Mathematica slovaca %D 2005 %P 307-316 %V 55 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/item/MASLO_2005__55_3_a5/ %G en %F MASLO_2005__55_3_a5