@article{ZVMMF_1976_16_3_a11,
     author = {G. M. Vainikko and \`E. \`E. Tamme},
     title = {Convergence of the difference method in the problem of periodic solutions of equations of elliptic type},
     journal = {\v{Z}urnal vy\v{c}islitelʹnoj matematiki i matemati\v{c}eskoj fiziki},
     pages = {652--664},
     publisher = {mathdoc},
     volume = {16},
     number = {3},
     year = {1976},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZVMMF_1976_16_3_a11/}
}