On the approximation of functions by a~hyperbolic angle in the $L_2$ metric
Matematičeskie zametki, Tome 65 (1999) no. 3, pp. 471-474.

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T. Yu. Kulikova. On the approximation of functions by a~hyperbolic angle in the $L_2$ metric. Matematičeskie zametki, Tome 65 (1999) no. 3, pp. 471-474. http://geodesic.mathdoc.fr/item/MZM_1999_65_3_a16/

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