@article{DAN_1960_132_3_a7,
     author = {Yu. I. Lyubich},
     title = {Almost periodic functions in the spectral analysis of operators},
     journal = {Doklady Akademii Nauk},
     pages = {518--520},
     publisher = {mathdoc},
     volume = {132},
     number = {3},
     year = {1960},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1960_132_3_a7/}
}