%0 Journal Article %A A. M. Sedletskii %T Equivalence of the trigonometric system and its perturbations in the spaces $L^p$ and~$C$ %J Sbornik. Mathematics %D 2019 %P 606-624 %V 210 %N 4 %I mathdoc %U http://geodesic.mathdoc.fr/item/SM_2019_210_4_a6/ %G en %F SM_2019_210_4_a6