%0 Journal Article %A A. A.-o. Babaev %A V. V. Salaev %T A one-dimensional singular operator with continuous density along a closed curve %J Doklady Akademii Nauk %D 1973 %P 1257-1260 %V 209 %N 6 %I mathdoc %U http://geodesic.mathdoc.fr/item/DAN_1973_209_6_a0/ %G ru %F DAN_1973_209_6_a0