MathSciNet bibliographic data MR1158733 (93c:41045) 41A50 (46E30 47B38) Šimša, Jaromír The best \$L\sp 2\$$L\sp 2$-approximation by finite sums of functions with separable variables. Aequationes Math. 43 (1992), no. 2-3, 248–263. Article

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