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@article{PORMA_1977__36_1_115297, author = {Hsiang, Fu Cheng}, title = {On the absolute convergence factors of an orthogonal series}, journal = {Portugaliae mathematica}, pages = {13--15}, publisher = {mathdoc}, volume = {36}, number = {1}, year = {1977}, mrnumber = {0535218}, zbl = {0407.42010}, language = {en}, url = {http://geodesic.mathdoc.fr/item/PORMA_1977__36_1_115297/} }
Hsiang, Fu Cheng. On the absolute convergence factors of an orthogonal series. Portugaliae mathematica, Tome 36 (1977) no. 1, pp. 13-15. http://geodesic.mathdoc.fr/item/PORMA_1977__36_1_115297/