%0 Journal Article %A Novák, Břetislav %T Remark on periodic solutions of a linear wave equation in one dimension %J Commentationes Mathematicae Universitatis Carolinae %D 1974 %P 513-519 %V 15 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/item/CMUC_1974__15_3_a9/ %G en %F CMUC_1974__15_3_a9