@article{10_21136_AM_1984_104097,
     author = {Stra\v{s}kraba, Ivan},
     title = {A note on critical times of $2\times2$ quasilinear hyperbolic systems},
     journal = {Applications of Mathematics},
     pages = {294--302},
     publisher = {mathdoc},
     volume = {29},
     number = {4},
     year = {1984},
     doi = {10.21136/AM.1984.104097},
     mrnumber = {0754081},
     zbl = {0564.35071},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.21136/AM.1984.104097/}
}