@article{MZM_1974_15_6_a6,
     author = {V. A. Il'in},
     title = {Some properties of a~regular solution of the {Helmholtz} equation in a~two-dimensional domain},
     journal = {Matemati\v{c}eskie zametki},
     pages = {885--890},
     publisher = {mathdoc},
     volume = {15},
     number = {6},
     year = {1974},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1974_15_6_a6/}
}