@article{BUMI_1961_3_16_4_a1,
     author = {Varshney, O. P.},
     title = {On the matrix summability of the derived {Fourier} series.},
     journal = {Bollettino della Unione matematica italiana},
     pages = {379--382},
     publisher = {mathdoc},
     volume = {Ser. 3, 16},
     number = {4},
     year = {1961},
     zbl = {0104.28703},
     mrnumber = {147839},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/BUMI_1961_3_16_4_a1/}
}