@article{DE_1979_15_8_a2,
     author = {Ya. S. Baris},
     title = {The reduction principle for a singularly perturbed system},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1390--1394},
     publisher = {mathdoc},
     volume = {15},
     number = {8},
     year = {1979},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1979_15_8_a2/}
}