@article{MZM_2008_84_5_a6,
     author = {G. A. Dzyubenko and M. G. Pleshakov},
     title = {Comonotone {Approximation} of {Periodic} {Functions}},
     journal = {Matemati\v{c}eskie zametki},
     pages = {713--723},
     publisher = {mathdoc},
     volume = {84},
     number = {5},
     year = {2008},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_2008_84_5_a6/}
}