@article{DAN_1958_119_1_a3,
     author = {G. I. Kats},
     title = {Expansion in characteristic functions of self-adjoint operators},
     journal = {Doklady Akademii Nauk},
     pages = {19--22},
     publisher = {mathdoc},
     volume = {119},
     number = {1},
     year = {1958},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1958_119_1_a3/}
}