@article{DE_1979_15_3_a8,
     author = {A. A. Shishkin},
     title = {Asymptotic behavior of the solution of a singular nonlinear system of ordinary differential equations},
     journal = {Differencialʹnye uravneni\^a},
     pages = {444--457},
     publisher = {mathdoc},
     volume = {15},
     number = {3},
     year = {1979},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1979_15_3_a8/}
}