Construction of a~polynomial for best approximation of a~derivative function in~$L_2[-1,1]$
Konstruktivnaya Teoriya Funktsii i Funktsional'nyi Analiz, Konstruktivnaya Teoriya Funktsii i Funktsional'nyi Analiz (1981), pp. 38-43.

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     author = {A. L. Kuz'mina},
     title = {Construction of a~polynomial for best approximation of a~derivative function in~$L_2[-1,1]$},
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A. L. Kuz'mina. Construction of a~polynomial for best approximation of a~derivative function in~$L_2[-1,1]$. Konstruktivnaya Teoriya Funktsii i Funktsional'nyi Analiz, Konstruktivnaya Teoriya Funktsii i Funktsional'nyi Analiz (1981), pp. 38-43. http://geodesic.mathdoc.fr/item/KUKTF_1981_a4/

[1] Shuvalova E. Z., “O postroenii elementa nailuchshego priblizheniya proizvodnoi”, UMN, 33:5(203) (1978), 203–204 | MR | Zbl

[2] Natanson I. P., Konstruktivnaya teoriya funktsii, M.–L., 1949 | MR