@article{DAN_1980_255_1_a6,
     author = {V. I. Ruban},
     title = {Diameters of sets in spaces of periodic functions.},
     journal = {Doklady Akademii Nauk},
     pages = {34--35},
     publisher = {mathdoc},
     volume = {255},
     number = {1},
     year = {1980},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1980_255_1_a6/}
}