@article{DAN_1987_293_1_a6,
     author = {V. S. Serov},
     title = {On absolute convergence of series in eigenfunctions of a},
     journal = {Doklady Akademii Nauk},
     pages = {37--41},
     publisher = {mathdoc},
     volume = {293},
     number = {1},
     year = {1987},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1987_293_1_a6/}
}