@article{DAN_1987_296_5_a4,
     author = {V. L. Kolyadin and V. F. Kravchenko},
     title = {The choice of subspaces in projection methods for solving operator},
     journal = {Doklady Akademii Nauk},
     pages = {1050--1052},
     publisher = {mathdoc},
     volume = {296},
     number = {5},
     year = {1987},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1987_296_5_a4/}
}