%0 Journal Article %A D. E. Edmunds %A %T Two-sided estimates of the approximation numbers of certain Volterra integral operators %J Studia Mathematica %D 1997 %P 59-80 %V 124 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/sm-124-1-59-80/ %R 10.4064/sm-124-1-59-80 %G en %F 10_4064_sm_124_1_59_80