@article{MZM_2015_98_4_a6,
     author = {A. I. Rubinshtein},
     title = {On {Best} {Convergence} of {Series} in the {Systems} $\varphi(nx)$},
     journal = {Matemati\v{c}eskie zametki},
     pages = {565--569},
     publisher = {mathdoc},
     volume = {98},
     number = {4},
     year = {2015},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_2015_98_4_a6/}
}