@article{DE_1981_17_10_a7,
     author = {M. A. Valiev and S. A. Lomov},
     title = {Asymptotic integration of singularly perturbed problems in {Hilbert} space},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1792--1805},
     publisher = {mathdoc},
     volume = {17},
     number = {10},
     year = {1981},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1981_17_10_a7/}
}