@article{DE_1988_24_6_a6,
     author = {E. M. Litsina},
     title = {On the general theory of linear functional-differential equations},
     journal = {Differencialʹnye uravneni\^a},
     pages = {977--986},
     publisher = {mathdoc},
     volume = {24},
     number = {6},
     year = {1988},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1988_24_6_a6/}
}