@article{GFA_1996__6_1_58222,
     author = {C. Morpurgo},
     title = {The {Logarithmic} {Hardy-Littlewood-Sobolev} {Inequlity} and {Extremals} of {Zeta} {Functions} on {Sn.}},
     journal = {Geometric and functional analysis},
     pages = {146--171},
     publisher = {mathdoc},
     volume = {6},
     number = {1},
     year = {1996},
     zbl = {0852.58079},
     url = {http://geodesic.mathdoc.fr/item/GFA_1996__6_1_58222/}
}