@article{MZ_1960__73_169845,
     author = {C.T. Rajagopal and M.R. Parameswaran},
     title = {Tauberian theorems invariant for a product of two summability methods.},
     journal = {Mathematische Zeitschrift},
     pages = {256--267},
     publisher = {mathdoc},
     volume = {73},
     year = {1960},
     zbl = {0091.24403},
     url = {http://geodesic.mathdoc.fr/item/MZ_1960__73_169845/}
}