@article{MZM_1977_22_2_a8,
     author = {Yu. K. Dem'yanovich},
     title = {A~weighted estimate of best approximations in $L_2(\Omega)$},
     journal = {Matemati\v{c}eskie zametki},
     pages = {245--255},
     publisher = {mathdoc},
     volume = {22},
     number = {2},
     year = {1977},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1977_22_2_a8/}
}