@article{MASLO_1981__31_4_a3,
     author = {Rzepecki, Bogdan},
     title = {A note on hyperbolic partial differential equations. {II.}},
     journal = {Mathematica slovaca},
     pages = {355--364},
     publisher = {mathdoc},
     volume = {31},
     number = {4},
     year = {1981},
     mrnumber = {637964},
     zbl = {0571.35065},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/MASLO_1981__31_4_a3/}
}