@article{GDZPPN00237319X,
title = {Some properties of fractional integrals. II.},
journal = {Mathematische Zeitschrift},
volume = {34},
year = {1932},
pages = {403-439},
zbl = {0003.15601},
url = {http://dml.mathdoc.fr/item/GDZPPN00237319X}
}
Hardy, G. H., and J.E.Littlewood,. Some properties of fractional integrals. II.. Mathematische Zeitschrift, Tome 34 (1932) pp. 403-439. http://gdmltest.u-ga.fr/item/GDZPPN00237319X/