@article{DAN_1971_198_4_a8,
     author = {\`E. M. Saak},
     title = {On the stability of the {Dirichlet} problem for a polyharmonic equation},
     journal = {Doklady Akademii Nauk},
     pages = {772--775},
     publisher = {mathdoc},
     volume = {198},
     number = {4},
     year = {1971},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1971_198_4_a8/}
}