TY - JOUR AU - Olach, Rudolf AU - Šamajová, Helena TI - Oscillatory properties of nonlinear differential systems with retarded arguments JO - Mathematica slovaca PY - 2005 SP - 307 EP - 316 VL - 55 IS - 3 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/MASLO_2005__55_3_a5/ LA - en ID - MASLO_2005__55_3_a5 ER -