@article{MZM_1975_18_4_a8,
     author = {A. A. Stakun},
     title = {Some spectral relations},
     journal = {Matemati\v{c}eskie zametki},
     pages = {561--568},
     publisher = {mathdoc},
     volume = {18},
     number = {4},
     year = {1975},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1975_18_4_a8/}
}