@article{DE_1995_31_8_a12,
     author = {K. E. Shiryaev},
     title = {On the {Baire} class of exponents of linear systems},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1381--1384},
     year = {1995},
     volume = {31},
     number = {8},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1995_31_8_a12/}
}