%0 Journal Article %A V. D. Budaev %T On Hilbert and Bessel inequalities for some sine, cosine and exponential systems %J Differencialʹnye uravneniâ %D 1997 %P 19-24 %V 33 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/item/DE_1997_33_1_a3/ %G ru %F DE_1997_33_1_a3