@article{GDZPPN00238941X,
title = {Tauberian theorems invariant for a product of two summability methods.},
journal = {Mathematische Zeitschrift},
volume = {73},
year = {1960},
pages = {256-267},
zbl = {0091.24403},
url = {http://dml.mathdoc.fr/item/GDZPPN00238941X}
}
Rajagopal, C.T.; Parameswaran, M.R. Tauberian theorems invariant for a product of two summability methods.. Mathematische Zeitschrift, Tome 73 (1960) pp. 256-267. http://gdmltest.u-ga.fr/item/GDZPPN00238941X/