%0 Journal Article %A Haluška, Vladimír %T On the existence of a solution of a vector periodic boundary value problem %J Mathematica slovaca %D 1991 %P 89-99 %V 41 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/item/MASLO_1991__41_1_a11/ %G en %F MASLO_1991__41_1_a11