@article{MZM_2007_82_5_a8,
     author = {A. I. Stepanets},
     title = {Extremal {Problems} for {Numerical} {Series}},
     journal = {Matemati\v{c}eskie zametki},
     pages = {736--755},
     publisher = {mathdoc},
     volume = {82},
     number = {5},
     year = {2007},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_2007_82_5_a8/}
}