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@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/} }
Došlý, Ondřej. Transformations of linear Hamiltonian systems preserving oscillatory behaviour. Archivum mathematicum, Tome 27 (1991) no. 3-4, pp. 211-219. http://geodesic.mathdoc.fr/item/ARM_1991__27_3-4_a10/