Geodesic
Best approximations by rational functions
Matematičeskie zametki, Tome 10 (1971) no. 1, pp. 11-15.

Voir la notice de l'article provenant de la source Math-Net.Ru

Description of a general class of real continuous functions on a segment $\Delta$ of the real line for which a best rational approximation with complex coefficients is not unique. 
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     author = {K. N. Lungu},
     title = {Best approximations by rational functions},
     journal = {Matemati\v{c}eskie zametki},
     pages = {11--15},
     publisher = {mathdoc},
     volume = {10},
     number = {1},
     year = {1971},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1971_10_1_a1/}
}
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K. N. Lungu. Best approximations by rational functions. Matematičeskie zametki, Tome 10 (1971) no. 1, pp. 11-15. http://geodesic.mathdoc.fr/item/MZM_1971_10_1_a1/