@article{MAN_1994__298_2_165160,
     author = {D.E. Edmunds and V.D. Stepanov},
     title = {The measure of non-compactness and approximation numbers of certain {Volterra} integral operators.},
     journal = {Mathematische Annalen},
     pages = {41--66},
     publisher = {mathdoc},
     volume = {298},
     number = {2},
     year = {1994},
     zbl = {0788.45013},
     url = {http://geodesic.mathdoc.fr/item/MAN_1994__298_2_165160/}
}