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@article{PORMA_1993__50_3_115692, author = {Alzer, Horst}, title = {On {Carleman's} inequality}, journal = {Portugaliae mathematica}, pages = {331--334}, publisher = {mathdoc}, volume = {50}, number = {3}, year = {1993}, mrnumber = {1244510}, zbl = {0793.26013}, language = {en}, url = {http://geodesic.mathdoc.fr/item/PORMA_1993__50_3_115692/} }
Alzer, Horst. On Carleman's inequality. Portugaliae mathematica, Tome 50 (1993) no. 3, pp. 331-334. http://geodesic.mathdoc.fr/item/PORMA_1993__50_3_115692/