@article{DE_1972_8_1_a20,
     author = {V. A. Il'in and Sh. A. Alimov},
     title = {Comment on conditions for the convergence of spectral expansions corresponding to self-adjoint extensions of elliptic operators},
     journal = {Differencialʹnye uravneni\^a},
     pages = {190},
     publisher = {mathdoc},
     volume = {8},
     number = {1},
     year = {1972},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1972_8_1_a20/}
}