@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/