Geodesic
On best approximations by rational functions with a~fixed number of poles
Sbornik. Mathematics, Tome 15 (1971) no. 2, pp. 313-324

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Estimates are obtained for the rate of the approximation of functions $f$ continuous on the interval $[0,1]$ and permitting bounded analytic continuation into the circle $K=\bigl\{z:|z-1|1\bigr\}$ by means of rational functions with a fixed number of geometrically different poles. Figures: 2. Bibliography: 7 titles. 
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     author = {K. N. Lungu},
     title = {On best approximations by rational functions with a~fixed number of poles},
     journal = {Sbornik. Mathematics},
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     volume = {15},
     number = {2},
     year = {1971},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1971_15_2_a7/}
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K. N. Lungu. On best approximations by rational functions with a~fixed number of poles. Sbornik. Mathematics, Tome 15 (1971) no. 2, pp. 313-324. http://geodesic.mathdoc.fr/item/SM_1971_15_2_a7/