@article{DAN_1984_276_3_a5,
     author = {B. M. Levitan and A. V. Savin},
     title = {Examples of {Schr\"odinger} operators with almost-periodic potentials and nowhere-dense absolutely continuous spectrum},
     journal = {Doklady Akademii Nauk},
     pages = {539--542},
     publisher = {mathdoc},
     volume = {276},
     number = {3},
     year = {1984},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1984_276_3_a5/}
}