@article{UMJ_2018_4_2_a2,
     author = {Marina V. Deikalova and Anastasiya Yu. Torgashova},
     title = {One-sided $L$-approximation on a sphere of the characteristic function of a layer},
     journal = {Ural mathematical journal},
     pages = {13--23},
     publisher = {mathdoc},
     volume = {4},
     number = {2},
     year = {2018},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/UMJ_2018_4_2_a2/}
}