%0 Journal Article
%A Jaromír Simsa
%T The best L2-approximation by finite sums of functions with separable variables.
%J Aequationes mathematicae
%D 1992
%P 248-263
%V 43
%N 1
%I mathdoc
%U http://geodesic.mathdoc.fr/item/AM2_1992__43_1_137468/
%F AM2_1992__43_1_137468