@article{MS2_1959__7_165720,
     author = {A.F. Andersen},
     title = {A {Condition} for {C-Summability} of {Negative} {Order.}},
     journal = {Mathematica Scandinavica},
     pages = {337--346},
     publisher = {mathdoc},
     volume = {7},
     year = {1959},
     zbl = {0091.24302},
     url = {http://geodesic.mathdoc.fr/item/MS2_1959__7_165720/}
}