%0 Journal Article %A Rzepecki, Bogdan %T A note on hyperbolic partial differential equations. II. %J Mathematica slovaca %D 1981 %P 355-364 %V 31 %N 4 %I mathdoc %U http://geodesic.mathdoc.fr/item/MASLO_1981__31_4_a3/ %G en %F MASLO_1981__31_4_a3