@article{ZVMMF_1985_25_9_a15,
     author = {A. Zemla},
     title = {Fundamental solution of the difference approximation of the {Helmholtz} operator},
     journal = {\v{Z}urnal vy\v{c}islitelʹnoj matematiki i matemati\v{c}eskoj fiziki},
     pages = {1416--1421},
     year = {1985},
     volume = {25},
     number = {9},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZVMMF_1985_25_9_a15/}
}