@article{GDZPPN002403218, title = {Multiplication Theorems for Strong N\"orlund Summability.}, journal = {Mathematische Zeitschrift}, volume = {105}, year = {1968}, pages = {33-42}, zbl = {0162.35701}, url = {http://dml.mathdoc.fr/item/GDZPPN002403218} }
Borwein, D.; Cass, F.P. Multiplication Theorems for Strong Nörlund Summability.. Mathematische Zeitschrift, Tome 105 (1968) pp. 33-42. http://gdmltest.u-ga.fr/item/GDZPPN002403218/