@article{DE_1999_35_3_a12,
     author = {\={I}. \={I}. Lazurchak and V. L. Makarov},
     title = {A two-sided {FD-method} for solving the {Dirichlet} problem for the {Helmholtz} equation},
     journal = {Differencialʹnye uravneni\^a},
     pages = {388--395},
     publisher = {mathdoc},
     volume = {35},
     number = {3},
     year = {1999},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1999_35_3_a12/}
}