%0 Journal Article %A S. V. Pereverzev %T Approximation numbers and the eigenvalue problem for integral operators %J Informatics and Automation %D 1987 %P 175-176 %V 180 %I mathdoc %U http://geodesic.mathdoc.fr/item/TRSPY_1987_180_a104/ %G ru %F TRSPY_1987_180_a104