@article{DE_1990_26_9_a23,
     author = {V. I. Kachalov},
     title = {Existence of solutions that are smooth with respect to the parameter for singularly perturbed equations},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1641--1643},
     publisher = {mathdoc},
     volume = {26},
     number = {9},
     year = {1990},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1990_26_9_a23/}
}