@article{10_21136_CMJ_1969_100899,
     author = {Lovicarov\'a, Hana},
     title = {Periodic solutions of a weakly nonlinear wave equation in one dimension},
     journal = {Czechoslovak Mathematical Journal},
     pages = {324--342},
     publisher = {mathdoc},
     volume = {19},
     number = {2},
     year = {1969},
     doi = {10.21136/CMJ.1969.100899},
     mrnumber = {0247249},
     zbl = {0181.10901},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.21136/CMJ.1969.100899/}
}