@article{MZM_1971_9_6_a0,
     author = {Sh. A. Alimov},
     title = {Expandibility in eigenfunctions of the {Laplacian} in a~two-dimension region},
     journal = {Matemati\v{c}eskie zametki},
     pages = {609--616},
     publisher = {mathdoc},
     volume = {9},
     number = {6},
     year = {1971},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1971_9_6_a0/}
}