@article{DAN_1964_159_4_a17,
     author = {R. S. Rutman and M. S. Epelman},
     title = {Parametric invariance of linear dynamical systems},
     journal = {Doklady Akademii Nauk},
     pages = {764--766},
     publisher = {mathdoc},
     volume = {159},
     number = {4},
     year = {1964},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1964_159_4_a17/}
}