@article{DE_1994_30_5_a7,
     author = {S. L. Edelstein},
     title = {Asymptotic splitting of boundary value problems for abstract differential equations},
     journal = {Differencialʹnye uravneni\^a},
     pages = {797--805},
     year = {1994},
     volume = {30},
     number = {5},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1994_30_5_a7/}
}