@article{GDZPPN00234596X, title = {A Condition for C-Summability of Negative Order.}, journal = {Mathematica Scandinavica}, volume = {7}, year = {1959}, pages = {337-346}, zbl = {0091.24302}, url = {http://dml.mathdoc.fr/item/GDZPPN00234596X} }
Andersen, A.F. A Condition for C-Summability of Negative Order.. Mathematica Scandinavica, Tome 7 (1959) pp. 337-346. http://gdmltest.u-ga.fr/item/GDZPPN00234596X/