@article{GDZPPN002405571, title = {Factor Sequences for Summability Matrices.}, journal = {Mathematische Zeitschrift}, volume = {111}, year = {1969}, pages = {389-392}, zbl = {0192.41702}, url = {http://dml.mathdoc.fr/item/GDZPPN002405571} }
Petersen, Gordon M. Factor Sequences for Summability Matrices.. Mathematische Zeitschrift, Tome 111 (1969) pp. 389-392. http://gdmltest.u-ga.fr/item/GDZPPN002405571/