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@article{MZ_1969__112_171250, author = {Gordon M. Petersen}, title = {Factor {Sequences} for {Summability} {Matrices.}}, journal = {Mathematische Zeitschrift}, pages = {389--392}, publisher = {mathdoc}, volume = {112}, year = {1969}, zbl = {0192.41702}, url = {http://geodesic.mathdoc.fr/item/MZ_1969__112_171250/} }
Gordon M. Petersen. Factor Sequences for Summability Matrices.. Mathematische Zeitschrift, Tome 112 (1969), pp. 389-392. http://geodesic.mathdoc.fr/item/MZ_1969__112_171250/