%0 Journal Article %A Rachůnková, Irena %T Periodic boundary value problems for third order differential equations %J Mathematica slovaca %D 1991 %P 241-248 %V 41 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/item/MASLO_1991__41_3_a2/ %G en %F MASLO_1991__41_3_a2