@article{SEMR_2013_10_a50,
     author = {A. V. Lobanov and R. V. Zubrev},
     title = {One the masking problem for the two-dimensional {Helmholtz} equation},
     journal = {Sibirskie \`elektronnye matemati\v{c}eskie izvesti\^a},
     pages = {378--392},
     publisher = {mathdoc},
     volume = {10},
     year = {2013},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/SEMR_2013_10_a50/}
}