%0 Journal Article %A A.F. Andersen %T A Condition for C-Summability of Negative Order. %J Mathematica Scandinavica %D 1959 %P 337-346 %V 7 %I mathdoc %U http://geodesic.mathdoc.fr/item/MS2_1959__7_165720/ %F MS2_1959__7_165720