@article{DE_1984_20_4_a3,
     author = {S. M. Labovski},
     title = {Positive solutions of linear functional-differential equations},
     journal = {Differencialʹnye uravneni\^a},
     pages = {578--584},
     publisher = {mathdoc},
     volume = {20},
     number = {4},
     year = {1984},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1984_20_4_a3/}
}