@article{DE_1990_26_6_a0,
     author = {L. M. Berezanskii},
     title = {Exponents of solutions of linear functional-differential equations},
     journal = {Differencialʹnye uravneni\^a},
     pages = {923--931},
     publisher = {mathdoc},
     volume = {26},
     number = {6},
     year = {1990},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1990_26_6_a0/}
}