@article{DAN_1988_298_4_a3,
     author = {M. I. Ganzburg},
     title = {Exact constants of the best harmonic approximation of a function},
     journal = {Doklady Akademii Nauk},
     pages = {788--791},
     publisher = {mathdoc},
     volume = {298},
     number = {4},
     year = {1988},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1988_298_4_a3/}
}