@article{10_21136_CMJ_1975_101350,
     author = {\v{S}t\v{e}dr\'y, Milan and Vejvoda, Otto},
     title = {Periodic solutions to weakly nonlinear autonomous wave equations},
     journal = {Czechoslovak Mathematical Journal},
     pages = {536--555},
     publisher = {mathdoc},
     volume = {25},
     number = {4},
     year = {1975},
     doi = {10.21136/CMJ.1975.101350},
     mrnumber = {0393762},
     zbl = {0319.35052},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.21136/CMJ.1975.101350/}
}