@article{DE_2006_42_2_a7,
     author = {S. L. Sobolevskii},
     title = {On a modification of the small parameter method},
     journal = {Differencialʹnye uravneni\^a},
     pages = {202--212},
     publisher = {mathdoc},
     volume = {42},
     number = {2},
     year = {2006},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_2006_42_2_a7/}
}