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@article{MS2_1959__7_165711, author = {G.M. Pettersen}, title = {Summability {Methods} and {Unbounded} {Sequences.}}, journal = {Mathematica Scandinavica}, pages = {170--176}, publisher = {mathdoc}, volume = {7}, year = {1959}, zbl = {0092.05502}, url = {http://geodesic.mathdoc.fr/item/MS2_1959__7_165711/} }
G.M. Pettersen. Summability Methods and Unbounded Sequences.. Mathematica Scandinavica, Tome 7 (1959), pp. 170-176. http://geodesic.mathdoc.fr/item/MS2_1959__7_165711/