@article{GDZPPN002345862, title = {Summability Methods and Unbounded Sequences.}, journal = {Mathematica Scandinavica}, volume = {7}, year = {1959}, pages = {170-176}, zbl = {0092.05502}, url = {http://dml.mathdoc.fr/item/GDZPPN002345862} }
Pettersen, G.M. Summability Methods and Unbounded Sequences.. Mathematica Scandinavica, Tome 7 (1959) pp. 170-176. http://gdmltest.u-ga.fr/item/GDZPPN002345862/