On differentiability of the operator of best approximation by rational fractions
Doklady Akademii Nauk, Tome 264 (1982) no. 5, pp. 1060-1062.

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     author = {A. V. Kolushov},
     title = {On differentiability of the operator of best approximation by rational fractions},
     journal = {Doklady Akademii Nauk},
     pages = {1060--1062},
     publisher = {mathdoc},
     volume = {264},
     number = {5},
     year = {1982},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1982_264_5_a7/}
}
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A. V. Kolushov. On differentiability of the operator of best approximation by rational fractions. Doklady Akademii Nauk, Tome 264 (1982) no. 5, pp. 1060-1062. http://geodesic.mathdoc.fr/item/DAN_1982_264_5_a7/