@article{DE_1992_28_9_a26,
     author = {V. A. Strizhkov},
     title = {A criterion for solvability in the large of singularly perturbed nonlinear problems},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1644--1646},
     publisher = {mathdoc},
     volume = {28},
     number = {9},
     year = {1992},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1992_28_9_a26/}
}