@article{DAN_1994_339_3_a3,
     author = {A. A. Martynyuk},
     title = {On some applications of the contraction principle},
     journal = {Doklady Akademii Nauk},
     pages = {304--306},
     publisher = {mathdoc},
     volume = {339},
     number = {3},
     year = {1994},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1994_339_3_a3/}
}