@article{DE_1984_20_6_a1,
     author = {Yu. P. Gubin and V. F. Safonov},
     title = {Asymptotic solutions of singularly perturbed problems with weak nonlinearity in the case of nonidentical resonance},
     journal = {Differencialʹnye uravneni\^a},
     pages = {930--941},
     publisher = {mathdoc},
     volume = {20},
     number = {6},
     year = {1984},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1984_20_6_a1/}
}