%0 Journal Article %A Straškraba, Ivan %T A note on critical times of $2\times2$ quasilinear hyperbolic systems %J Applications of Mathematics %D 1984 %P 294-302 %V 29 %N 4 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.21136/AM.1984.104097/ %R 10.21136/AM.1984.104097 %G en %F 10_21136_AM_1984_104097