@article{ARM_1985__21_2_a5,
     author = {Do\v{s}l\'y, Ond\v{r}ej},
     title = {The basic properties of phase matrices of linear differential systems},
     journal = {Archivum mathematicum},
     pages = {113--121},
     publisher = {mathdoc},
     volume = {21},
     number = {2},
     year = {1985},
     mrnumber = {817553},
     zbl = {0579.34007},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/ARM_1985__21_2_a5/}
}