@article{ARM_1991__27_3-4_a10,
     author = {Do\v{s}l\'y, Ond\v{r}ej},
     title = {Transformations of linear {Hamiltonian} systems preserving oscillatory behaviour},
     journal = {Archivum mathematicum},
     pages = {211--219},
     publisher = {mathdoc},
     volume = {27},
     number = {3-4},
     year = {1991},
     mrnumber = {1189218},
     zbl = {0764.34026},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/ARM_1991__27_3-4_a10/}
}