@article{MZ_1957__67_169677,
     author = {C.T. Rajagopal},
     title = {On a theorem of {Frobenius} and {Knopp} for {Abel} summability.},
     journal = {Mathematische Zeitschrift},
     pages = {310--319},
     publisher = {mathdoc},
     volume = {67},
     year = {1957},
     zbl = {0077.27703},
     url = {http://geodesic.mathdoc.fr/item/MZ_1957__67_169677/}
}