%0 Journal Article %A D. Przeworska-Rolewicz %T On periodic solutions of linear differential-difference equations with constant coefficients %J Studia Mathematica %D 1968 %P 507-511 %V 31 %N 5 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/sm-31-5-507-511/ %R 10.4064/sm-31-5-507-511 %G en %F 10_4064_sm_31_5_507_511