%0 Journal Article %A A. M. Olevskii %T On the extension of a sequence of functions to a complete orthonormal system %J Matematičeskie zametki %D 1969 %P 737-747 %V 6 %N 6 %U http://geodesic.mathdoc.fr/item/MZM_1969_6_6_a9/ %G ru %F MZM_1969_6_6_a9