@article{DE_1998_34_3_a1,
     author = {N. E. Barabanov},
     title = {On the existence of an extremal norm for a class of linear differential equations with retarded argument},
     journal = {Differencialʹnye uravneni\^a},
     pages = {294--297},
     publisher = {mathdoc},
     volume = {34},
     number = {3},
     year = {1998},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1998_34_3_a1/}
}