@article{DAN_1993_330_6_a6,
     author = {G. A. Sviridyuk and T. V. Apetova},
     title = {Phase spaces of linear dynamical equations of {Sobolev} type},
     journal = {Doklady Akademii Nauk},
     pages = {696--699},
     year = {1993},
     volume = {330},
     number = {6},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1993_330_6_a6/}
}