@article{10_21136_CMJ_1978_101539,
     author = {Herrmann, Leopold and \v{S}t\v{e}dr\'y, Milan},
     title = {Periodic solutions of weakly nonlinear wave equations in unbounded intervals},
     journal = {Czechoslovak Mathematical Journal},
     pages = {343--355},
     publisher = {mathdoc},
     volume = {28},
     number = {3},
     year = {1978},
     doi = {10.21136/CMJ.1978.101539},
     mrnumber = {501201},
     zbl = {0396.35067},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.21136/CMJ.1978.101539/}
}