Geodesic
Connectedness of sets in best approximation problems
Doklady Akademii Nauk, Tome 261 (1981) no. 1, pp. 20-23.

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     author = {S. V. Konyagin},
     title = {Connectedness of sets in best approximation problems},
     journal = {Doklady Akademii Nauk},
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     publisher = {mathdoc},
     volume = {261},
     number = {1},
     year = {1981},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1981_261_1_a3/}
}
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S. V. Konyagin. Connectedness of sets in best approximation problems. Doklady Akademii Nauk, Tome 261 (1981) no. 1, pp. 20-23. http://geodesic.mathdoc.fr/item/DAN_1981_261_1_a3/