%0 Journal Article %A Rudolf, Boris %T Periodic boundary value problem in Hilbert space for differential equation of second order with reflection of the argument %J Mathematica slovaca %D 1992 %P 65-84 %V 42 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/item/MASLO_1992__42_1_a5/ %G en %F MASLO_1992__42_1_a5