%0 Journal Article %A A. M. Olevskii %T Extension of DuBois-Reymond's theorem to bounded orthonormal systems of functions %J Doklady Akademii Nauk %D 1965 %P 1069-1072 %V 163 %N 5 %I mathdoc %U http://geodesic.mathdoc.fr/item/DAN_1965_163_5_a6/ %G ru %F DAN_1965_163_5_a6