@article{TRSPY_1987_180_a55,
     author = {A. S. Dzhafarov},
     title = {On best approximation of functions in the spaces~$B$ and~$H$},
     journal = {Informatics and Automation},
     pages = {100--103},
     publisher = {mathdoc},
     volume = {180},
     year = {1987},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TRSPY_1987_180_a55/}
}