Geodesic
On the degree of approximation of the Sobolev class $W_q^r$ by bilinear forms in $L_p$ for $1\leqslant q\leqslant p\leqslant 2$
Sbornik. Mathematics, Tome 72 (1992) no. 1, pp. 113-120 Cet article a éte moissonné depuis la source Math-Net.Ru

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The degree of best approximation by bilinear forms in $L_p$, where $1\leqslant q\leqslant p\leqslant 2$, is established for the class $W_q^r$. 
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M. Babayev. On the degree of approximation of the Sobolev class $W_q^r$ by bilinear forms in $L_p$ for $1\leqslant q\leqslant p\leqslant 2$. Sbornik. Mathematics, Tome 72 (1992) no. 1, pp. 113-120. http://geodesic.mathdoc.fr/item/SM_1992_72_1_a5/

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