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@article{MZ_1968__107_171048, author = {D. Borwein and F.P. Cass}, title = {Multiplication {Theorems} for {Strong} {N\"orlund} {Summability.}}, journal = {Mathematische Zeitschrift}, pages = {33--42}, publisher = {mathdoc}, volume = {107}, year = {1968}, zbl = {0162.35701}, url = {http://geodesic.mathdoc.fr/item/MZ_1968__107_171048/} }
D. Borwein; F.P. Cass. Multiplication Theorems for Strong Nörlund Summability.. Mathematische Zeitschrift, Tome 107 (1968), pp. 33-42. http://geodesic.mathdoc.fr/item/MZ_1968__107_171048/