@article{MZM_1979_25_2_a6,
     author = {G. M. Il'mushkin},
     title = {Spectral functions of a~regular symmetric difference operator},
     journal = {Matemati\v{c}eskie zametki},
     pages = {249--257},
     year = {1979},
     volume = {25},
     number = {2},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1979_25_2_a6/}
}