@article{MZM_2001_69_3_a3,
     author = {D. V. Gorbachev},
     title = {Extremum {Problem} for {Periodic} {Functions} {Supported} in a {Ball}},
     journal = {Matemati\v{c}eskie zametki},
     pages = {346--352},
     publisher = {mathdoc},
     volume = {69},
     number = {3},
     year = {2001},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_2001_69_3_a3/}
}