@article{DAN_1964_156_5_a10,
     author = {F. S. Rofe-Beketov},
     title = {Expansion in eigenfunctions of systems with summable potential},
     journal = {Doklady Akademii Nauk},
     pages = {1029--1032},
     publisher = {mathdoc},
     volume = {156},
     number = {5},
     year = {1964},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1964_156_5_a10/}
}