@article{DE_1968_4_4_a10,
     author = {V. E. Popovich},
     title = {Estimate of the error in the method of successive approximations},
     journal = {Differencialʹnye uravneni\^a},
     pages = {668--674},
     publisher = {mathdoc},
     volume = {4},
     number = {4},
     year = {1968},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1968_4_4_a10/}
}