@article{10_1007_s10587_012_0054_1,
     author = {Rocha, Pablo and Urciuolo, M.},
     title = {On the $H^{p}$-$L^{q}$ boundedness of some fractional integral operators},
     journal = {Czechoslovak Mathematical Journal},
     pages = {625--635},
     publisher = {mathdoc},
     volume = {62},
     number = {3},
     year = {2012},
     doi = {10.1007/s10587-012-0054-1},
     mrnumber = {2984623},
     zbl = {1265.42046},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.1007/s10587-012-0054-1/}
}