@article{DE_1985_21_10_a27,
     author = {Yu. A. Konyaev},
     title = {A new approach to the investigation of linear singularly perturbed problems in the presence of identically multiple and imaginary points of the spectrum},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1811--1814},
     publisher = {mathdoc},
     volume = {21},
     number = {10},
     year = {1985},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1985_21_10_a27/}
}