@article{DE_1983_19_10_a24,
     author = {Yu. M. Rappoport},
     title = {A modification of the approximation method},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1809--1813},
     publisher = {mathdoc},
     volume = {19},
     number = {10},
     year = {1983},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1983_19_10_a24/}
}