@article{GDZPPN002369931, title = {Some properties of fractional integrals. I.}, journal = {Mathematische Zeitschrift}, volume = {28}, year = {1928}, pages = {565-606}, zbl = {54.0275.05}, url = {http://dml.mathdoc.fr/item/GDZPPN002369931} }
Hardy, G. H., und J.; J. E. Littlewood. Some properties of fractional integrals. I.. Mathematische Zeitschrift, Tome 28 (1928) pp. 565-606. http://gdmltest.u-ga.fr/item/GDZPPN002369931/