@article{DE_1991_27_12_a18,
     author = {A. G. Baskakov},
     title = {Spectral properties of the differential operator $\frac d{dt}-A_0$ with an unbounded operator $A_0$},
     journal = {Differencialʹnye uravneni\^a},
     pages = {2162--2164},
     publisher = {mathdoc},
     volume = {27},
     number = {12},
     year = {1991},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1991_27_12_a18/}
}