%0 Journal Article %A Vejvoda, Otto %T Periodic solutions of a linear and weakly nonlinear wave equation in one dimension, I %J Czechoslovak Mathematical Journal %D 1964 %P 341-382 %V 14 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.21136/CMJ.1964.100626/ %R 10.21136/CMJ.1964.100626 %G en %F 10_21136_CMJ_1964_100626