@article{DAN_1968_181_6_a7,
     author = {A. S. Libin},
     title = {Trace formulas for self-adjoint operators},
     journal = {Doklady Akademii Nauk},
     pages = {1327--1330},
     publisher = {mathdoc},
     volume = {181},
     number = {6},
     year = {1968},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1968_181_6_a7/}
}