%0 Journal Article %A Pinda, Ľudovít %T On a fourth order periodic boundary value problem %J Archivum mathematicum %D 1994 %P 1-8 %V 30 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/item/ARM_1994__30_1_a0/ %G en %F ARM_1994__30_1_a0