@article{FAA_1986_20_3_a4,
     author = {V. A. Sadovnichii and V. A. Lyubishkin},
     title = {Finite-dimensional perturbations of discrete operators and formulas for traces},
     journal = {Funkcionalʹnyj analiz i ego prilo\v{z}eni\^a},
     pages = {55--65},
     publisher = {mathdoc},
     volume = {20},
     number = {3},
     year = {1986},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/FAA_1986_20_3_a4/}
}