@article{TIMM_2009_15_1_a6,
     author = {V. S. Balaganskii},
     title = {Exact constant in the {Jackson--Stechkin} inequality in the space $L^2$ on the period},
     journal = {Trudy Instituta matematiki i mehaniki},
     pages = {79--101},
     publisher = {mathdoc},
     volume = {15},
     number = {1},
     year = {2009},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TIMM_2009_15_1_a6/}
}