@article{10_21136_MB_1991_126179,
     author = {Vejvoda, Otto and Krej\v{c}{\'\i}, Pavel},
     title = {A note to a bifurcation result of {H.} {Kielh\"ofer} for the wave equation},
     journal = {Mathematica Bohemica},
     pages = {245--247},
     publisher = {mathdoc},
     volume = {116},
     number = {3},
     year = {1991},
     doi = {10.21136/MB.1991.126179},
     mrnumber = {1126446},
     zbl = {0773.35008},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.21136/MB.1991.126179/}
}