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@article{MZ_1969__112_171247, author = {Frank P. Cass}, title = {Convexity {Theorems} for {N\"orlund} and {Strong} {N\"orlund} {Summability.}}, journal = {Mathematische Zeitschrift}, pages = {357--363}, publisher = {mathdoc}, volume = {112}, year = {1969}, zbl = {0182.08504}, url = {http://geodesic.mathdoc.fr/item/MZ_1969__112_171247/} }
Frank P. Cass. Convexity Theorems for Nörlund and Strong Nörlund Summability.. Mathematische Zeitschrift, Tome 112 (1969), pp. 357-363. http://geodesic.mathdoc.fr/item/MZ_1969__112_171247/