@article{DAN_1990_310_6_a1,
     author = {G. M. Kobel'kov},
     title = {A priori estimates for elliptic equations, and iterative methods},
     journal = {Doklady Akademii Nauk},
     pages = {1293--1296},
     publisher = {mathdoc},
     volume = {310},
     number = {6},
     year = {1990},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1990_310_6_a1/}
}