Geodesic
Approximation of $x^k\operatorname{sign}x$ by rational fractions of a certain type
Vestnik Moskovskogo universiteta. Matematika, mehanika, no. 4 (1988), pp. 55-58

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     author = {T. N. Razinkova},
     title = {Approximation of $x^k\operatorname{sign}x$ by rational fractions of a certain type},
     journal = {Vestnik Moskovskogo universiteta. Matematika, mehanika},
     pages = {55--58},
     publisher = {mathdoc},
     number = {4},
     year = {1988},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VMUMM_1988_4_a11/}
}
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T. N. Razinkova. Approximation of $x^k\operatorname{sign}x$ by rational fractions of a certain type. Vestnik Moskovskogo universiteta. Matematika, mehanika, no. 4 (1988), pp. 55-58. http://geodesic.mathdoc.fr/item/VMUMM_1988_4_a11/