@article{TRSPY_1995_211_a21,
     author = {M. S. Nikol'skii and D. B. Silin},
     title = {On the best approximation of a~convex compact set by elements of addial},
     journal = {Informatics and Automation},
     pages = {338--354},
     publisher = {mathdoc},
     volume = {211},
     year = {1995},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TRSPY_1995_211_a21/}
}