@article{EMJ_2014_5_1_a4,
     author = {M. R. Langarshoev},
     title = {Sharp inequality of {Jackson--Stechkin} type and widths of functional classes in the space $L_2$},
     journal = {Eurasian mathematical journal},
     pages = {122--134},
     publisher = {mathdoc},
     volume = {5},
     number = {1},
     year = {2014},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/EMJ_2014_5_1_a4/}
}