@article{DAN_1984_276_1_a12,
     author = {N. N. Yakovlev},
     title = {Asymptotic estimates of the densities of lattice $k$-packings and $k$-coverings, and the structure of the spectrum of the {Schr\"odinger} operator with a periodic potential},
     journal = {Doklady Akademii Nauk},
     pages = {54--57},
     publisher = {mathdoc},
     volume = {276},
     number = {1},
     year = {1984},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1984_276_1_a12/}
}