@article{MZM_1975_17_3_a1,
     author = {A. G. Marchuk and K. Yu. Osipenko},
     title = {Best approximation of functions specified with an~error at a~finite number of points},
     journal = {Matemati\v{c}eskie zametki},
     pages = {359--368},
     publisher = {mathdoc},
     volume = {17},
     number = {3},
     year = {1975},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1975_17_3_a1/}
}