@article{GDZPPN002222817, title = {Some Summability Invariants.}, journal = {Manuscripta mathematica}, volume = {31}, year = {1980}, pages = {363-378}, zbl = {0435.40008}, url = {http://dml.mathdoc.fr/item/GDZPPN002222817} }
Beekmann, W.; Chang, Shao-Chien. Some Summability Invariants.. Manuscripta mathematica, Tome 31 (1980) pp. 363-378. http://gdmltest.u-ga.fr/item/GDZPPN002222817/