%0 Journal Article %A M. F. Timan %T Best partial approximations of functions, absolute convergence of Fourier series, and nuclearity of Hilbert–Schmidt operators %J Sbornik. Mathematics %D 1968 %P 329-342 %V 4 %N 3 %U http://geodesic.mathdoc.fr/item/SM_1968_4_3_a3/ %G en %F SM_1968_4_3_a3