@article{DAN_1967_174_3_a2,
     author = {Yu. K. Dem'yanovich},
     title = {Estimates of the rate of convergence of certain projection methods of solving elliptic equations},
     journal = {Doklady Akademii Nauk},
     pages = {518--521},
     publisher = {mathdoc},
     volume = {174},
     number = {3},
     year = {1967},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1967_174_3_a2/}
}