@article{GDZPPN002405393, title = {Two Problems in Summability.}, journal = {Mathematische Zeitschrift}, volume = {111}, year = {1969}, pages = {221-221}, zbl = {0175.34701}, url = {http://dml.mathdoc.fr/item/GDZPPN002405393} }
Wilansky, Albert; Bennett, Graham. Two Problems in Summability.. Mathematische Zeitschrift, Tome 111 (1969) p. 221. http://gdmltest.u-ga.fr/item/GDZPPN002405393/