@article{MZ_1932__34_168318,
     author = {G. H., and J.E.Littlewood, Hardy},
     title = {Some properties of fractional integrals. {II.}},
     journal = {Mathematische Zeitschrift},
     pages = {403--439},
     publisher = {mathdoc},
     volume = {34},
     year = {1932},
     zbl = {0003.15601},
     url = {http://geodesic.mathdoc.fr/item/MZ_1932__34_168318/}
}