@article{DE_1997_33_10_a0,
     author = {A. G. Baskakov},
     title = {Spectral analysis of linear differential operators, and semigroups of difference {operators.~I}},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1299--1306},
     publisher = {mathdoc},
     volume = {33},
     number = {10},
     year = {1997},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1997_33_10_a0/}
}