@article{MZ_1957__68_169690,
     author = {M.R. Parameswaran},
     title = {Some product theorems in summability.},
     journal = {Mathematische Zeitschrift},
     pages = {19--26},
     publisher = {mathdoc},
     volume = {68},
     year = {1957},
     zbl = {0079.28401},
     url = {http://geodesic.mathdoc.fr/item/MZ_1957__68_169690/}
}