@article{DAN_1958_120_5_a8,
     author = {V. A. Marchenko and F. S. Rofe-Beketov},
     title = {Expansion in characteristic functions of no self-adjoined singular differential operators},
     journal = {Doklady Akademii Nauk},
     pages = {963--966},
     publisher = {mathdoc},
     volume = {120},
     number = {5},
     year = {1958},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1958_120_5_a8/}
}