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@article{MZ_1969__112_171243, author = {Paul Schaefer}, title = {Matrix {Transformations} of {Almost} {Convergent} {Sequences.}}, journal = {Mathematische Zeitschrift}, pages = {321--325}, publisher = {mathdoc}, volume = {112}, year = {1969}, zbl = {0181.33501}, url = {http://geodesic.mathdoc.fr/item/MZ_1969__112_171243/} }
Paul Schaefer. Matrix Transformations of Almost Convergent Sequences.. Mathematische Zeitschrift, Tome 112 (1969), pp. 321-325. http://geodesic.mathdoc.fr/item/MZ_1969__112_171243/