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@article{BUMI_1961_3_16_4_a6, author = {Sharma, P. L.}, title = {On the absolute negative summability of double {Fourier} series.}, journal = {Bollettino della Unione matematica italiana}, pages = {408--411}, publisher = {mathdoc}, volume = {Ser. 3, 16}, number = {4}, year = {1961}, zbl = {0104.28903}, mrnumber = {141946}, language = {en}, url = {http://geodesic.mathdoc.fr/item/BUMI_1961_3_16_4_a6/} }
Sharma, P. L. On the absolute negative summability of double Fourier series.. Bollettino della Unione matematica italiana, Série 3, Tome 16 (1961) no. 4, pp. 408-411. http://geodesic.mathdoc.fr/item/BUMI_1961_3_16_4_a6/