@article{DE_1990_26_8_a1,
     author = {Sh. T. Dzhabbarov},
     title = {A generalized contraction mapping principle, and infinite systems of differential equations},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1299--1309},
     publisher = {mathdoc},
     volume = {26},
     number = {8},
     year = {1990},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1990_26_8_a1/}
}