@article{CMUC_1972__13_1_a15,
     author = {Doktor, Alexander},
     title = {Mixed problem for semilinear hyperbolic equation of second order with the {Dirichlet} boundary condition {(Preliminary} communication)},
     journal = {Commentationes Mathematicae Universitatis Carolinae},
     pages = {185--189},
     publisher = {mathdoc},
     volume = {13},
     number = {1},
     year = {1972},
     mrnumber = {0310441},
     zbl = {0229.35055},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CMUC_1972__13_1_a15/}
}