@article{MZ_1986__193_173782,
     author = {Pavel Krejci},
     title = {Hysteresis and {Periodic} {Solutions} of {Semilinear} and {Quasilinear} {Wave} {Equations.}},
     journal = {Mathematische Zeitschrift},
     pages = {247--264},
     publisher = {mathdoc},
     volume = {193},
     year = {1986},
     zbl = {0658.35065},
     url = {http://geodesic.mathdoc.fr/item/MZ_1986__193_173782/}
}